| Condition | Possible Cause | Action |
|---|---|---|
|
Excessive nitrogen oxides (NOx) emission
|
Fuel pressure out of specification
|
|
|
Lead contamination of three way catalytic converter
|
Check for absence of filler neck restrictor
|
|
|
Closed loop system (A/F feed back compensation) fails
– Faulty TP sensor
– Faulty ECT sensor or MAP sensor
– Faulty oxygen sensor
|
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|
Faulty injector
|
||
|
Faulty ECM
|
||
|
Faulty EGR system (if equipped)
|