Faulty Signal

Faulty signal

Checking software




Checking software

Checking software

Note! The information below only applies to modal year 2003-2004.For other model years, select the alternative "No".

It may be possible to remedy the fault by downloading new software into the control module.

Action
- Go to the tab software and program the control module with the latest software.

Other information
- For more information, see Design and Function.





Has the fault been remedied?

Yes - Fault Found

No - No Fault Found

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FAULT FOUND - Fault Found

No Fault Found - Checking for air leakage in the exhaust system

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Checking for air leakage in the exhaust system
Check for air leakage according to Checking for air leakage in the exhaust system, B5244T5, B5254T2 Air Leakage Exhaust System, Check
Remedy as necessary.

Was there any air leakage?

Yes - Verification

No - Replacing component

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Replacing component
Try a new front heated oxygen sensor (HO2S) and select Continue when this has been done.
- To access/replace the front heated oxygen sensor (HO2S), see Heated oxygen sensor (HO2S), replacing Heated Oxygen Sensor (HO2S), Replacing.


Continue - Verification

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Verification




Verification

Verification

Hint: After carrying out the repair, check that the fault has been remedied.








- Ignition off.
- Reconnect connectors, reinstall components.
- Start the engine and let it idle.
- Read off the lambda value for the rear heated oxygen sensor (HO2S).
After 25 seconds idling, the value should stabilize at 0.8 - 1.2.









Is the value OK?

Yes - VERIFIED

No - VERIFICATION FAILED

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VERIFICATION FAILED - Fault-tracing information

VERIFIED - Fault Found

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Fault-tracing information




Information

Fault-tracing information
If the fault is intermittent, do not verify fault-tracing if the fault does not recur.
It is possible to view the information again, or leave fault-tracing for this diagnostic trouble code (DTC).

Do you want to view the information again?

Yes - Attempt New Test

No - Fault Found

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Attempt New Test - Checking for air leakage in the exhaust system

FAULT FOUND - DONE

DONE - DONE

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