125000735 - Z55 CATALYZER ERROR

The diagnostic equipment signals the following error: Catalyzer
Results of the tests
0PRELIMINARY CHECKSAll OKProblems metOperation
Connect the diagnostic equipment (Examiner or Examiner Plus) and record the errors and environmental parameters.Check for the Catalyzer error onlyEnd of diagnosisThe Upstream Lambda signal error is presentContinue according to the instructions inSee table    See table Z56 UPSTREAM LAMBDA SENSOR SIGNAL ERROR
The Mixture strength error is presentContinue according to the instructions inSee table    See table Z50 MIXTURE STRENGTH ERROR
The misfire error is presentContinue according to the instructions inSee table    See table Z53 MISFIRE ERROR
The downstream Lambda signal error is presentContinue according to the instructions inSee table    See table Z58 DOWNSTREAM LAMBDA SENSOR SIGNAL ERROR
The Catalyzer error only is presentContinue to Step 1
Other errors are presentIdentify and eliminate the cause of the problem.Continue to Step 5
1EXHAUST SYSTEM LEAKS CHECKAll OKProblems metOperation
Check the exhaust system, visually and by listening, from the cylinder head outlet to the downstream Lambda sensor.Check that there are no leaksContinue to Step 2There are leaksRestore the correct seal for the exhaust system, if necessary, replace the components involved.Continue to Step 5
2ROAD TEST TO CHECK MIXTURE STRENGTHAll OKProblems metOperation
Road test the vehicle and check the mixture strength in the 1st and 2nd closed loops using the diagnostic equipment. Check that the activation is correctContinue to Step 3The 1st closed loop activation is not correctContinue according to the instructions inSee table    See table Z56 UPSTREAM LAMBDA SENSOR SIGNAL ERROR
The 2nd closed loop activation is not correctContinue according to the instructions inSee table    See table Z58 DOWNSTREAM LAMBDA SENSOR SIGNAL ERROR
3CHECKING INTAKE AND EXHAUST SYSTEM SEALAll OKProblems metOperation
Check the exhaust system visually and by listening, to check that there are no leaks from the cylinder head outlet to the upstream lambda sensorContinue to Step 4Seal not correctRestore the correct seal for the system, if necessary, replace the components involved.Continue to Step 5
4REPLACING THE CATALYZERAll OKProblems metOperation
Replace the catalyzer Op.    Op. 1080B65 CATALYTIC CONVERTER ASSEMBLY R RContinue to Step 5.
5ERROR CANCELLING AND CHECKINGAll OKProblems metOperation
Use a tester to cancel the errors in the control unit.Carry out a road test and ensure the error does not recur.Continue to Step 6The fault persists, it is the first time that this step has been reached and the catalyzer has not yet been replaced
The fault persists, but it is the second time that this step has been reached or the catalyzer has already been replacedContact Technical Support for further information on the problem
6CHECK ON CORRECT OPERATIONAll OKProblems metOperation
Check that the fault is no longer presentEnd of diagnosis.