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Skyvisions, ASE Certified Technician
Category: Toyota
Satisfied Customers: 14417
Experience:  Toyota Master Diagnostic
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Re 1999 Toyota Solara V6. Getting Error Code P0125, P1135, P1133.1.

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Re 1999 Toyota Solara V6. Getting Error Code P0125, P1135, P1133.
1. Insufficient coolant temp for closed loop fuel control.
2. Air/Fuel heat circuit response B1 S1
3. Air/Fuel circuit response B1 S1

Car runs fine and temp gauge reads normal. Disconnected the battery to clear the code and then took it for a drive. The "Check Engine" light came on again after about 4 minutes of driving.

Do you tink it's a sensor that's gone bad?
Which sensors could be involved?

Thank you for your help.


The P1135 is a low current malfunction on the AFR heater circuit of bank 1 sensor 1. Ideally you need to test the voltage at the computer Pin HAF1 it should read 12 volts. With in a minute or two the voltage should drop to 0 to 2 volts when the computer turns the ground circuit on to energize the circuit and heat up the sensor. If the voltage is not 12 volts then you need to check the voltage at the sensor. If the computer never drops the voltage then the driver is bad in the computer. 90% of the time the AFR sensor is bad but in some rare cases I have seen them take out the computer also. Click the link below for some more info. The P1133 is low response of the same sensor and the P0125 means the sensor is not responding in time in correlation to coolant temp. B1S1 sensor is in the manifold back by the firewall no the radiator. If the sensor starts to stick put brake fluid on the threads then let it set and then work it back and forth and it will come out. Do not buy cheap after market sensors this is an AFR sensor not an O2 sensor. They are different. Go to for online wholesale prices.




Customer: replied 7 years ago.


Is there only one AFR sensor? Will I be able to find tha part by that name?


There are two AFR sensors B1 which is usually referred to as the right sensor. Then there is B2 which is right at the radiator in the manifold and may be considered the left sensor. If you go to that website and enter in AFR sensor it will bring them up. They may even be the same sensor part number on this vehicle. The other option is if you shoot them an e-mail with your vehicle identification number they can give you an exact part number and price.



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