How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Skyvisions Your Own Question
Skyvisions
Skyvisions, ASE Certified Technician
Category: Toyota
Satisfied Customers: 14503
Experience:  Toyota Master Diagnostic
8257649
Type Your Toyota Question Here...
Skyvisions is online now
A new question is answered every 9 seconds

I just changed my catalytic converter and i've driven it two

Customer Question

hey i just changed my catalytic converter and i've driven it for about two weeks, and i drive it for a while each time and i drive it for a while each time before i take it to do a smog test but each time it tells me the catalytic converter is not responding i really dont know what to do anymore, i've switched all of the O2 sensors already
Submitted: 1 year ago.
Category: Toyota
Expert:  Skyvisions replied 1 year ago.

Do you have a printout of the failure or what they're talking about as far as the catalytic converter? I need to read their exact wording so I can understand what's going on.

Customer: replied 1 year ago.
it says 'Cat Con: Incom', and the guy keeps telling me its the computer doesnt read the catalytic.
Expert:  Skyvisions replied 1 year ago.

This means that the computer has not seen the catalytic converter complete its drive cycle or test cycle. This can only be because one of three things the first one being the computer is bad which is highly unlikely. The second one being the proper drive pattern or drive cycle has not been driven correctly given the ambient temperature coolant temperature of the engine and specific drive pattern. All of these criteria have to be met in order for this to complete its testing cycle. The third possible option is you have a bad converter that is new or one of the sensors is not recording correctly. If you used all Toyota parts this probably can be ruled out also it never seemed defective converters or sensors from the dealer. Listed below is the specific drive cycle that you need to drive a couple of times to get it to complete its drive cycle pattern. Let me know how things go. The first drive pattern criteria is if you have oxygen sensor systems if you have air fuel ratio sensor systems the second drive pattern criteria is what you need to follow.

Preconditions
The monitor will not run unless:
 MIL is OFF.
 ECT (Coolant Temp) is 176F (80C) or greater.
 IAT (Intake Air) is 14F (–10C) or greater.*
* For 2002 MY and later vehicles: The readiness test can be completed in cold ambient conditions
(less than 14F / –10C), if the drive pattern is repeated a second time after cycling the ignition OFF.

Drive Pattern Procedure
Connect the OBDII Scantool to DLC3 to check monitor status and preconditions.
Note the IAT (Intake Air) value during engine startup. The driving time must be adjusted
during step “a” based upon IAT (Intake Air) value at startup.
a. Drive the vehicle at 40 – 55 mph (64 – 88 km/h) for the time described below:
 If IAT (Intake Air) was less than 50F (10C) when the engine was started,
drive for 7 minutes.
 If IAT (Intake Air) was greater than 50F (10C) when the engine was started,
drive for 3 minutes.
b. Drive the vehicle at 35 – 45 mph (56 – 72 km/h) for approximately 7 minutes.
NOTE:
 Drive with smooth throttle operation.
 Avoid sudden acceleration.
 Avoid sudden deceleration as much as possible with the throttle fully closed.
If readiness status does not switch to “complete,” ensure preconditions are met, turn the
ignition OFF, then repeat steps “a” and “b.”
NOTE:
The readiness status may not switch to “complete” after the first drive pattern trip if a
Pending Code has been set (first trip for a two–trip DTC).
 Pending Codes are available from the DTC Info Menu in Enhanced OBDII.
 Pending Codes indicate a POTENTIAL problem was detected. A second trip is
needed to confirm the DTC prior to diagnosis.

Preconditions
The monitor will not run unless:
 MIL is OFF.
 ECT (Coolant Temp) is 176F (80C) or greater.
 IAT (Intake Air) is 14F (–10C) or greater.*
* For 2002 MY and later vehicles: The readiness test can be completed in cold ambient conditions
(less than 14F / –10C), if the drive pattern is repeated a second time after cycling the ignition OFF.
Drive Pattern Procedure
Connect the OBDII Scantool to DLC3 to check monitor status and preconditions.
Note the IAT (Intake Air) value during engine startup. The driving time must be adjusted
during step “a” based upon IAT (Intake Air) value at startup.
a. Drive the vehicle at 40 – 55 mph (64 – 88 km/h) for the time described below:
 If IAT (Intake Air) was less than 50F (10C) when the engine was started,
drive for 7 minutes.
 If IAT (Intake Air) was greater than 50F (10C) when the engine was started,
drive for 3 minutes.
b. Drive the vehicle allowing speed to fluctuate between 35 – 45 mph (56 – 72 km/h)
for about 16 minutes.
NOTE:
 Drive with smooth throttle operation.
 Avoid sudden acceleration.
 Avoid sudden deceleration as much as possible with the throttle fully closed.
If readiness status does not switch to “complete,” ensure preconditions are met, turn the
ignition OFF, then repeat steps “a” and “b.”
NOTE:
The readiness status may not switch to “complete” after the first drive pattern trip if a
Pending Code has been set (first trip for a two–trip DTC).
 Pending Codes are available from the DTC Info Menu in Enhanced OBDII.
 Pending Codes indicate a POTENTIAL problem was detected. A second trip is
needed to confirm the DTC prior to diagnosis.
 Once a second trip is completed, a current DTC will be stored.

Expert:  Skyvisions replied 1 year ago.

This means that the computer has not seen the catalytic converter complete its drive cycle or test cycle. This can only be because one of three things the first one being the computer is bad which is highly unlikely. The second one being the proper drive pattern or drive cycle has not been driven correctly given the ambient temperature coolant temperature of the engine and specific drive pattern. All of these criteria have to be met in order for this to complete its testing cycle. The third possible option is you have a bad converter that is new or one of the sensors is not recording correctly. If you used all Toyota parts this probably can be ruled out also it never seemed defective converters or sensors from the dealer. Listed below is the specific drive cycle that you need to drive a couple of times to get it to complete its drive cycle pattern. Let me know how things go. The first drive pattern criteria is if you have oxygen sensor systems if you have air fuel ratio sensor systems the second drive pattern criteria is what you need to follow.

Preconditions
The monitor will not run unless:
 MIL is OFF.
 ECT (Coolant Temp) is 176F (80C) or greater.
 IAT (Intake Air) is 14F (–10C) or greater.*
* For 2002 MY and later vehicles: The readiness test can be completed in cold ambient conditions
(less than 14F / –10C), if the drive pattern is repeated a second time after cycling the ignition OFF.

Drive Pattern Procedure
Connect the OBDII Scantool to DLC3 to check monitor status and preconditions.
Note the IAT (Intake Air) value during engine startup. The driving time must be adjusted
during step “a” based upon IAT (Intake Air) value at startup.
a. Drive the vehicle at 40 – 55 mph (64 – 88 km/h) for the time described below:
 If IAT (Intake Air) was less than 50F (10C) when the engine was started,
drive for 7 minutes.
 If IAT (Intake Air) was greater than 50F (10C) when the engine was started,
drive for 3 minutes.
b. Drive the vehicle at 35 – 45 mph (56 – 72 km/h) for approximately 7 minutes.
NOTE:
 Drive with smooth throttle operation.
 Avoid sudden acceleration.
 Avoid sudden deceleration as much as possible with the throttle fully closed.
If readiness status does not switch to “complete,” ensure preconditions are met, turn the
ignition OFF, then repeat steps “a” and “b.”
NOTE:
The readiness status may not switch to “complete” after the first drive pattern trip if a
Pending Code has been set (first trip for a two–trip DTC).
 Pending Codes are available from the DTC Info Menu in Enhanced OBDII.
 Pending Codes indicate a POTENTIAL problem was detected. A second trip is
needed to confirm the DTC prior to diagnosis.

Preconditions
The monitor will not run unless:
 MIL is OFF.
 ECT (Coolant Temp) is 176F (80C) or greater.
 IAT (Intake Air) is 14F (–10C) or greater.*
* For 2002 MY and later vehicles: The readiness test can be completed in cold ambient conditions
(less than 14F / –10C), if the drive pattern is repeated a second time after cycling the ignition OFF.
Drive Pattern Procedure
Connect the OBDII Scantool to DLC3 to check monitor status and preconditions.
Note the IAT (Intake Air) value during engine startup. The driving time must be adjusted
during step “a” based upon IAT (Intake Air) value at startup.
a. Drive the vehicle at 40 – 55 mph (64 – 88 km/h) for the time described below:
 If IAT (Intake Air) was less than 50F (10C) when the engine was started,
drive for 7 minutes.
 If IAT (Intake Air) was greater than 50F (10C) when the engine was started,
drive for 3 minutes.
b. Drive the vehicle allowing speed to fluctuate between 35 – 45 mph (56 – 72 km/h)
for about 16 minutes.
NOTE:
 Drive with smooth throttle operation.
 Avoid sudden acceleration.
 Avoid sudden deceleration as much as possible with the throttle fully closed.
If readiness status does not switch to “complete,” ensure preconditions are met, turn the
ignition OFF, then repeat steps “a” and “b.”
NOTE:
The readiness status may not switch to “complete” after the first drive pattern trip if a
Pending Code has been set (first trip for a two–trip DTC).
 Pending Codes are available from the DTC Info Menu in Enhanced OBDII.
 Pending Codes indicate a POTENTIAL problem was detected. A second trip is
needed to confirm the DTC prior to diagnosis.
 Once a second trip is completed, a current DTC will be stored.

Expert:  Skyvisions replied 1 year ago.

This means that the computer has not seen the catalytic converter complete its drive cycle or test cycle. This can only be because one of three things the first one being the computer is bad which is highly unlikely. The second one being the proper drive pattern or drive cycle has not been driven correctly given the ambient temperature coolant temperature of the engine and specific drive pattern. All of these criteria have to be met in order for this to complete its testing cycle. The third possible option is you have a bad converter that is new or one of the sensors is not recording correctly. If you used all Toyota parts this probably can be ruled out also it never seemed defective converters or sensors from the dealer. Listed below is the specific drive cycle that you need to drive a couple of times to get it to complete its drive cycle pattern. Let me know how things go. The first drive pattern criteria is if you have oxygen sensor systems if you have air fuel ratio sensor systems the second drive pattern criteria is what you need to follow.

Preconditions
The monitor will not run unless:
 MIL is OFF.
 ECT (Coolant Temp) is 176F (80C) or greater.
 IAT (Intake Air) is 14F (–10C) or greater.*
* For 2002 MY and later vehicles: The readiness test can be completed in cold ambient conditions
(less than 14F / –10C), if the drive pattern is repeated a second time after cycling the ignition OFF.

Drive Pattern Procedure
Connect the OBDII Scantool to DLC3 to check monitor status and preconditions.
Note the IAT (Intake Air) value during engine startup. The driving time must be adjusted
during step “a” based upon IAT (Intake Air) value at startup.
a. Drive the vehicle at 40 – 55 mph (64 – 88 km/h) for the time described below:
 If IAT (Intake Air) was less than 50F (10C) when the engine was started,
drive for 7 minutes.
 If IAT (Intake Air) was greater than 50F (10C) when the engine was started,
drive for 3 minutes.
b. Drive the vehicle at 35 – 45 mph (56 – 72 km/h) for approximately 7 minutes.
NOTE:
 Drive with smooth throttle operation.
 Avoid sudden acceleration.
 Avoid sudden deceleration as much as possible with the throttle fully closed.
If readiness status does not switch to “complete,” ensure preconditions are met, turn the
ignition OFF, then repeat steps “a” and “b.”
NOTE:
The readiness status may not switch to “complete” after the first drive pattern trip if a
Pending Code has been set (first trip for a two–trip DTC).
 Pending Codes are available from the DTC Info Menu in Enhanced OBDII.
 Pending Codes indicate a POTENTIAL problem was detected. A second trip is
needed to confirm the DTC prior to diagnosis.

Preconditions
The monitor will not run unless:
 MIL is OFF.
 ECT (Coolant Temp) is 176F (80C) or greater.
 IAT (Intake Air) is 14F (–10C) or greater.*
* For 2002 MY and later vehicles: The readiness test can be completed in cold ambient conditions
(less than 14F / –10C), if the drive pattern is repeated a second time after cycling the ignition OFF.
Drive Pattern Procedure
Connect the OBDII Scantool to DLC3 to check monitor status and preconditions.
Note the IAT (Intake Air) value during engine startup. The driving time must be adjusted
during step “a” based upon IAT (Intake Air) value at startup.
a. Drive the vehicle at 40 – 55 mph (64 – 88 km/h) for the time described below:
 If IAT (Intake Air) was less than 50F (10C) when the engine was started,
drive for 7 minutes.
 If IAT (Intake Air) was greater than 50F (10C) when the engine was started,
drive for 3 minutes.
b. Drive the vehicle allowing speed to fluctuate between 35 – 45 mph (56 – 72 km/h)
for about 16 minutes.
NOTE:
 Drive with smooth throttle operation.
 Avoid sudden acceleration.
 Avoid sudden deceleration as much as possible with the throttle fully closed.
If readiness status does not switch to “complete,” ensure preconditions are met, turn the
ignition OFF, then repeat steps “a” and “b.”
NOTE:
The readiness status may not switch to “complete” after the first drive pattern trip if a
Pending Code has been set (first trip for a two–trip DTC).
 Pending Codes are available from the DTC Info Menu in Enhanced OBDII.
 Pending Codes indicate a POTENTIAL problem was detected. A second trip is
needed to confirm the DTC prior to diagnosis.
 Once a second trip is completed, a current DTC will be stored.

Expert:  Skyvisions replied 1 year ago.

This means that the computer has not seen the catalytic converter complete its drive cycle or test cycle. This can only be because one of three things the first one being the computer is bad which is highly unlikely. The second one being the proper drive pattern or drive cycle has not been driven correctly given the ambient temperature coolant temperature of the engine and specific drive pattern. All of these criteria have to be met in order for this to complete its testing cycle. The third possible option is you have a bad converter that is new or one of the sensors is not recording correctly. If you used all Toyota parts this probably can be ruled out also it never seemed defective converters or sensors from the dealer. Listed below is the specific drive cycle that you need to drive a couple of times to get it to complete its drive cycle pattern. Let me know how things go. The first drive pattern criteria is if you have oxygen sensor systems if you have air fuel ratio sensor systems the second drive pattern criteria is what you need to follow.

Preconditions
The monitor will not run unless:
 MIL is OFF.
 ECT (Coolant Temp) is 176F (80C) or greater.
 IAT (Intake Air) is 14F (–10C) or greater.*
* For 2002 MY and later vehicles: The readiness test can be completed in cold ambient conditions
(less than 14F / –10C), if the drive pattern is repeated a second time after cycling the ignition OFF.

Drive Pattern Procedure
Connect the OBDII Scantool to DLC3 to check monitor status and preconditions.
Note the IAT (Intake Air) value during engine startup. The driving time must be adjusted
during step “a” based upon IAT (Intake Air) value at startup.
a. Drive the vehicle at 40 – 55 mph (64 – 88 km/h) for the time described below:
 If IAT (Intake Air) was less than 50F (10C) when the engine was started,
drive for 7 minutes.
 If IAT (Intake Air) was greater than 50F (10C) when the engine was started,
drive for 3 minutes.
b. Drive the vehicle at 35 – 45 mph (56 – 72 km/h) for approximately 7 minutes.
NOTE:
 Drive with smooth throttle operation.
 Avoid sudden acceleration.
 Avoid sudden deceleration as much as possible with the throttle fully closed.
If readiness status does not switch to “complete,” ensure preconditions are met, turn the
ignition OFF, then repeat steps “a” and “b.”
NOTE:
The readiness status may not switch to “complete” after the first drive pattern trip if a
Pending Code has been set (first trip for a two–trip DTC).
 Pending Codes are available from the DTC Info Menu in Enhanced OBDII.
 Pending Codes indicate a POTENTIAL problem was detected. A second trip is
needed to confirm the DTC prior to diagnosis.

Preconditions
The monitor will not run unless:
 MIL is OFF.
 ECT (Coolant Temp) is 176F (80C) or greater.
 IAT (Intake Air) is 14F (–10C) or greater.*
* For 2002 MY and later vehicles: The readiness test can be completed in cold ambient conditions
(less than 14F / –10C), if the drive pattern is repeated a second time after cycling the ignition OFF.
Drive Pattern Procedure
Connect the OBDII Scantool to DLC3 to check monitor status and preconditions.
Note the IAT (Intake Air) value during engine startup. The driving time must be adjusted
during step “a” based upon IAT (Intake Air) value at startup.
a. Drive the vehicle at 40 – 55 mph (64 – 88 km/h) for the time described below:
 If IAT (Intake Air) was less than 50F (10C) when the engine was started,
drive for 7 minutes.
 If IAT (Intake Air) was greater than 50F (10C) when the engine was started,
drive for 3 minutes.
b. Drive the vehicle allowing speed to fluctuate between 35 – 45 mph (56 – 72 km/h)
for about 16 minutes.
NOTE:
 Drive with smooth throttle operation.
 Avoid sudden acceleration.
 Avoid sudden deceleration as much as possible with the throttle fully closed.
If readiness status does not switch to “complete,” ensure preconditions are met, turn the
ignition OFF, then repeat steps “a” and “b.”
NOTE:
The readiness status may not switch to “complete” after the first drive pattern trip if a
Pending Code has been set (first trip for a two–trip DTC).
 Pending Codes are available from the DTC Info Menu in Enhanced OBDII.
 Pending Codes indicate a POTENTIAL problem was detected. A second trip is
needed to confirm the DTC prior to diagnosis.
 Once a second trip is completed, a current DTC will be stored.

Expert:  Skyvisions replied 1 year ago.

This means that the computer has not seen the catalytic converter complete its drive cycle or test cycle. This can only be because one of three things the first one being the computer is bad which is highly unlikely. The second one being the proper drive pattern or drive cycle has not been driven correctly given the ambient temperature coolant temperature of the engine and specific drive pattern. All of these criteria have to be met in order for this to complete its testing cycle. The third possible option is you have a bad converter that is new or one of the sensors is not recording correctly. If you used all Toyota parts this probably can be ruled out also it never seemed defective converters or sensors from the dealer. Listed below is the specific drive cycle that you need to drive a couple of times to get it to complete its drive cycle pattern. Let me know how things go. The first drive pattern criteria is if you have oxygen sensor systems if you have air fuel ratio sensor systems the second drive pattern criteria is what you need to follow.

Preconditions
The monitor will not run unless:
MIL is OFF.
ECT (Coolant Temp) is 176[1]F (80[1]C) or greater.
IAT (Intake Air) is 14[1]F (–10[1]C) or greater.*
* For 2002 MY and later vehicles: The readiness test can be completed in cold ambient conditions
(less than 14[1]F / –10[1]C), if the drive pattern is repeated a second time after cycling the ignition OFF.

Drive Pattern Procedure
Connect the OBDII Scantool to DLC3 to check monitor status and preconditions.
Note the IAT (Intake Air) value during engine startup. The driving time must be adjusted
during step “a” based upon IAT (Intake Air) value at startup.
a. Drive the vehicle at 40 – 55 mph (64 – 88 km/h) for the time described below:
If IAT (Intake Air) was less than 50[1]F (10[1]C) when the engine was started,
drive for 7 minutes.
If IAT (Intake Air) was greater than 50[1]F (10[1]C) when the engine was started,
drive for 3 minutes.
b. Drive the vehicle at 35 – 45 mph (56 – 72 km/h) for approximately 7 minutes.
NOTE:
Drive with smooth throttle operation.
Avoid sudden acceleration.
Avoid sudden deceleration as much as possible with the throttle fully closed.
If readiness status does not switch to “complete,” ensure preconditions are met, turn the
ignition OFF, then repeat steps “a” and “b.”
NOTE:
The readiness status may not switch to “complete” after the first drive pattern trip if a
Pending Code has been set (first trip for a two–trip DTC).
Pending Codes are available from the DTC Info Menu in Enhanced OBDII.
Pending Codes indicate a POTENTIAL problem was detected. A second trip is
needed to confirm the DTC prior to diagnosis.

Preconditions
The monitor will not run unless:
MIL is OFF.
ECT (Coolant Temp) is 176[1]F (80[1]C) or greater.
IAT (Intake Air) is 14[1]F (–10[1]C) or greater.*
* For 2002 MY and later vehicles: The readiness test can be completed in cold ambient conditions
(less than 14[1]F / –10[1]C), if the drive pattern is repeated a second time after cycling the ignition OFF.
Drive Pattern Procedure
Connect the OBDII Scantool to DLC3 to check monitor status and preconditions.
Note the IAT (Intake Air) value during engine startup. The driving time must be adjusted
during step “a” based upon IAT (Intake Air) value at startup.
a. Drive the vehicle at 40 – 55 mph (64 – 88 km/h) for the time described below:
If IAT (Intake Air) was less than 50[1]F (10[1]C) when the engine was started,
drive for 7 minutes.
If IAT (Intake Air) was greater than 50[1]F (10[1]C) when the engine was started,
drive for 3 minutes.
b. Drive the vehicle allowing speed to fluctuate between 35 – 45 mph (56 – 72 km/h)
for about 16 minutes.
NOTE:
Drive with smooth throttle operation.
Avoid sudden acceleration.
Avoid sudden deceleration as much as possible with the throttle fully closed.
If readiness status does not switch to “complete,” ensure preconditions are met, turn the
ignition OFF, then repeat steps “a” and “b.”
NOTE:
The readiness status may not switch to “complete” after the first drive pattern trip if a
Pending Code has been set (first trip for a two–trip DTC).
Pending Codes are available from the DTC Info Menu in Enhanced OBDII.
Pending Codes indicate a POTENTIAL problem was detected. A second trip is
needed to confirm the DTC prior to diagnosis.
Once a second trip is completed, a current DTC will be stored.

Expert:  Skyvisions replied 1 year ago.

Sorry for the delay for some reason it would not send the information through it kept Locking up. Let me know if you need any other input on this issue.