3022755 - W02 CO EMISSIONS LOW, NOx EMISSIONS HIGH

The CO percentage measured is very low, with a corresponding NOx percentage higher than the recommended figure.
Results of the tests
1CHECKING WITH DIAGNOSTIC EQUIPMENTAll OKProblems metOperation
Connect diagnostic equipment (Examiner or other instruments) to the diagnostic socket.Check that there are no faults in the engine management control unitContinue to Step 2'Fuel system' error appears See table   Z50  MIXTURE STRENGTH ERROR
'Misfiring' error appears See table   Z53  MISFIRE ERROR
'Catalytic converter' error detected See table   Z55  CATALYZER ERROR
'Upstream lambda sensor' error detected See table   Z56  UPSTREAM LAMBDA SENSOR SIGNAL ERROR
'Downstream lambda sensor' error detected See table   Z58  DOWNSTREAM LAMBDA SENSOR SIGNAL ERROR
Another error detected 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 See   E5030  PETROL ENGINE ELECTRONIC MANAGEMENT
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 and the solenoid with the control unit See   E5030  PETROL ENGINE ELECTRONIC MANAGEMENT
Faulty injectorReplace injector Op.   1056B70 
3UPSTREAM LAMBDA SENSOR CHECKAll OKProblems metOperation
Check that the upstream Lambda sensor is working properly See Test   1080BA  CHECK ON UPSTREAM LAMBDA SENSOR OPERATION' Continue to Step 4Left Lambda sensor faultyReplace the left Lambda sensor Op.   1080B93 
Right Lambda sensor faultyReplace the right Lambda sensor Op.   1080B92 
4DOWNSTREAM LAMBDA SENSOR CHECKAll OKProblems metOperation
Check that the downstream Lambda sensor is working properly See Test   1080BD  CHECK ON DOWNSTREAM LAMBDA SENSOR OPERATION' Continue to Step 5Lambda sensor defectiveReplace the Lambda sensor Op. 1080B90
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 7Circuit faultyRestore the operation of the system
Fault in the separatorReplace the separator
7CHECKING FUEL PRESSUREAll OKProblems metOperation
Check the fuel supply pressure Op.   0510C10  Continue to Step 8Pressure not correctReplace the fuel pump
8CHECKING CORRECT OPERATIONAll OKProblems metOperation
Check that the fault is no longer presentFault persistsSearch for the fault starting from another symptom'