Condition | Possible Cause | Action |
---|---|---|
Excessive nitrogen oxides (NOx) emission
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Improper ignition timing
|
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Lead contamination of catalytic converter
|
Check for absence of filler neck restrictor
|
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Faulty EGR system
|
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Fuel pressure out of specification
|
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Closed loop system (A/F feed back compensation) fails
– Faulty TP sensor
– Poor performance of ECT sensor or MAF sensor
|
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Faulty injector(s)
|
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Faulty ECM
|
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Camshaft position control (VVT) system out of order
|