2427625 - W02 CO EMISSIONS LOW, NOx EMISSIONS HIGH

The CO percentage measured is very low, with a corresponding NOx percentage higher than recommended levels
Results of the tests
1CHECKING WITH DIAGNOSTIC EQUIPMENTAll OKProblems metOperation
Connect the diagnostic equipment (Examiner or other instruments) to the diagnostic socketCheck that there are no fault in the engine management control unitContinue to Step 2'Supply system' error detectedSee table   Z50 
'Misfire' error detectedSee table   Z53 
'Catalytic converter' error detectedSee table   Z55 
'Upstream lambda sensor' error detectedSee table   Z56 
'Downstream lambda sensor' error detectedSee table   Z58 
Another error dected in the control unitContinue following the instructions for the diagnostic equipment.
Lack of dialogue with the control unitRestore the connection between the engine management control unit and the diagnostic connector
2ACTIVE DIAGNOSIS WITH DIAGNOSTIC EQUIPMENTAll OKProblems metOperation
Using the diagnostic equipment (Examiner or other instruments) carry out the active diagnosis of the injectorsContinue to Step 3Connections faultyRestore the connection of the injectors with the control unit
Injector faultyReplace injector Op.   1056B70 
3UPSTREAM LAMBDA SENSOR CHECKAll OKProblems metOperation
Check that the upstream Lambda sensor is working properly.Continue to Step 4Lambda sensor faultyReplace the Lambda sensor Op.   1080B94 
4DOWNSTREAM LAMDBA SENSOR CHECKAll OKProblems metOperation
Check that the downstream Lambda sensor is working properly.Continue to Step 5Lambda sensor faultyReplace the Lambda sensor Op.   1080B95 
5CHECKING AIR CIRCUITAll OKProblems metOperation
Check the condition of the air supply circuitContinue to Step 6Circuit component damagedReplace the component involved
6CHECKING BLOW-BY CIRCUITAll OKProblems metOperation
Check the condition of the blow-by gas intake circuit, in particular, check that there are no obstructions in the separator or the pipesContinue to Step 7Faulty circuitRestore the operation of the system
Fault in the separatorReplace the separator
7CHECK ON FUEL PRESSUREAll OKProblems metOperation
Check the fuel supply pressure Op.   0510C10  Continue to Step 8Pressure not correctReplace the fuel pump
8CHECK ON CORRECT OPERATIONAll OKProblems metOperation
Check that the fault is no longer presentEnd of diagnosisThe fault persists