194002432 - W02 CO EMISSIONS LOW, NOX EMISSIONS HIGH

The CO percentage measured is very low, whilst the NOX percentage is higher than recommended.
Results of the tests
1CHECK USING DIAGNOSTIC EQUIPMENTAll OKProblems encounteredOperation
Connect the diagnostic test equipment (Examiner or other instruments) to the tester input.Check that there are no faults in the engine management control unitMove on to Step 2"Fuel system" error detectedSee table    Z50 ERRORE TITOLO MISCELA
"Misfire" error detectedSee table    Z53 ERRORE MANCATE ACCENSIONI
"Catalyzer" error detectedSee table    Z55 ERRORE CATALIZZATORE
"Upstream Lambda sensor" error detectedSee table    Z56 ERRORE SEGNALE LAMBDA A MONTE
"Downstream Lambda sensor" error detectedSee table    Z58 ERRORE SEGNALE LAMBDA A VALLE
Another error detected in the control unitContinue following the instructions for the diagnostic equipment
No communication with the control unitRestore the connection between the engine management control unit and the diagnostic connector See    See E5030 PETROL ENGINES ELECTRONIC MANAGEMENT
2ACTIVE DIAGNOSIS WITH DIAGNOSTIC EQUIPMENTAll OKProblems encounteredOperation
Connect the diagnostic equipment (Examiner or other instruments) and carry out the active diagnosis for the injectors.Move on to Step 3Connections faultyRestore connection for injectors and solenoid valve with control unit See    See E5030 PETROL ENGINES ELECTRONIC MANAGEMENT
Injector faultReplace the injector Op.    Op. 1056B70 INJECTOR (ONE) - R + R WITH FUEL MANIFOLD PIPE REMOVED - INCLUDES SEAL REPLACEMNT
3UPSTREAM LAMBDA SENSOR CHECKAll OKProblems encounteredOperation
Check that the upstream Lambda sensor is working properly See TestSee Test 1080BA CHECK ON OPERATION OF UPSTREAM LAMBDA SENSORMove on to Step 4Left Lambda sensor defectiveReplace the left Lambda sensor Op.    Op. 1080B94 FRONT LAMBDA SENSOR TO WITH CATALYTIC CONVERTER - R.R
Right Lambda sensor defectiveReplace the right Lambda sensor Op.    Op. 1080B94 FRONT LAMBDA SENSOR TO WITH CATALYTIC CONVERTER - R.R
4DOWNSTREAM LAMBDA SENSOR CHECKAll OKProblems encounteredOperation
Check that the downstream Lambda sensor is working properly See TestSee Test 1080BD CHECK ON OPERATION OF DOWNSTREAM LAMBDA SENSORMove on to Step 5Lambda sensor defectiveReplace the Lambda sensor    Op. 1080B95 REAR LAMBDA SENSOR TO CATALYTIC CONVERTER - R.R
5AIR CIRCUIT CHECKAll OKProblems encounteredOperation
Check the condition of the air supply circuitMove on to Step 6Circuit component damagedReplace the component involved
6BLOW-BY CIRCUIT CHECKAll OKProblems encounteredOperation
Check the condition of the blow-by gas intake circuit: in particular, check for obstructions in the separator or pipes.Move on to Step 7Circuit faultyRestore circuit to working order
Fault in the separatorReplace the separator
7FUEL PRESSURE CHECKAll OKProblems encounteredOperation
Check the fuel supply pressure Op.    Op. 0510C10 FUEL SYSTEM - CHECK DELIVERY PRESSUREMove on to Step 8Pressure not correctReplace the fuel pump
8CHECK CORRECT OPERATIONAll OKProblems encounteredOperation
Check that the fault is no longer presentFault persistsSearch for the fault starting from another symptom