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Eric
Eric, Automotive Repair Shop Manager
Category: Jaguar
Satisfied Customers: 31909
Experience:  Automotive Repair Shop Manager, Technician/JA Mentor
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Tried to get smoged but they told me the cat converter

Customer Question

tried to get smoged but they told me the cat converter monitor won
JA: How many miles are on the car? Have you been losing oil or coolant?
Customer: 't reset
JA: What is the model/year of your Jaguar?
Customer: xj8 2002
JA: Are you fixing your XJ8 yourself? What have you tried so far?
Customer: auto shop did the test
JA: Anything else you want the mechanic to know before I connect you?
Customer: no
Submitted: 9 months ago.
Category: Jaguar
Expert:  Eric replied 9 months ago.

Hi,

Ok, has the battery been recently disconnected or the check engine light on recently?

Customer: replied 9 months ago.
new battery
Customer: replied 9 months ago.
the cat converter monitor won't reset
Expert:  Eric replied 9 months ago.

HI,

Ok, have you just been driving it around to try to get it to reset, or have you done the condition based drive cycle

Expert:  Eric replied 9 months ago.

HI,

this is the drive cycle to perform to set the catalyst monitor to readiness to pass emissions testing

2002 Jaguar XJ-8 Sedan (X308) V8-4.0L (AJ27)

Save Article

CATALYST EFFICIENCY MONITOR DRIVE CYCLE

1. Start engine and bring to normal operating temperature > 75 degree C (167 degree F).

2. With the gear selector in Park or Neutral, hold the engine speed at 2500 rpm for 5 minutes.

3. Drive vehicle for 10 minutes ensuring that vehicle speed exceeds 15 km/h (10 mph) and the engine speed exceeds 1500 rpm.

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Expert:  Eric replied 8 months ago.

I noticed we have not yet resolved your concern you asked about. I would sure appreciate it if you would reply so I can offer my skills and knowledge and repair guide access to help as best I can.

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Customer: replied 8 months ago.
il tried the drive cycle but the cat converter monitor still did not reset. any other ideas
Expert:  Eric replied 8 months ago.

HI,

The only other reasons would be due to a marginal catalytic converter that although doesnt set a P0420 code, is degraded enough to prevent the monitor from setting, or less likely but possible, a low voltage condition at the ECM.

Customer: replied 8 months ago.
can they test for the low voltage condition at the ECM otherwise i'll just change the cat converter
Expert:  Eric replied 8 months ago.

Hi,

yes, a scan tool can be used to test the ecm and voltages to it