What Does P02A0 Mean?
The ECM has determined that the fuel injector on cylinder 2 is restricted and not delivering the commanded amount of fuel. This code is set when individual cylinder fuel trim analysis shows cylinder 2 consistently needs maximum positive fuel correction due to insufficient fuel delivery from the injector. The driver may notice a rough idle, cylinder 2 misfire, hesitation under acceleration, and potential lean-related catalytic converter issues.
Common Causes
45%
Clogged or partially blocked cylinder 2 injector nozzle from fuel deposits, varnish, or contamination
20%
Contaminated fuel with water or debris clogging the injector's internal passages
15%
Injector pintle or needle partially seized from corrosion or deposits, reducing fuel flow
10%
Fuel rail supply issue near cylinder 2 position causing localized low pressure
10%
Electrical fault reducing injector energize time or solenoid pull force
Diagnostic Steps
1
Perform an injector balance test by disabling each injector individually; a smaller-than-expected RPM drop on cylinder 2 confirms reduced fuel delivery.
2
Remove the cylinder 2 fuel injector and test on an injector flow bench; compare spray pattern, atomization quality, and flow volume to specification and other injectors.
3
Attempt professional ultrasonic cleaning of the cylinder 2 injector; retest flow after cleaning. If flow does not improve to within 5% of specification, replace the injector.
4
Inspect and replace the fuel filter if it is past service interval or shows contamination; pull a fuel sample and check for water or sediment.
5
Check injector electrical circuit: measure resistance (compare to spec), verify 12V supply, and check ECM ground pulse with a noid light to confirm proper injector activation.
Estimated Repair Cost
$50 - $500
Parts + labor, varies by vehicle and location
The ECM has determined that the fuel injector on cylinder 2 is restricted and not delivering the commanded amount of fuel. This code is set when individual cylinder fuel trim analysis shows cylinder 2 consistently needs maximum positive fuel correction due to insufficient fuel delivery from the inje...
The most common cause of P02A0 (Cylinder 2 - Injector Restricted) is: Clogged or partially blocked cylinder 2 injector nozzle from fuel deposits, varnish, or contamination
Typical repair costs for P02A0 range from $50 to $500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Short-distance driving is acceptable but avoid sustained high-load operation. A restricted injector causes a lean cylinder which elevates exhaust temperature and can damage the catalytic converter. Lean misfires at speed pose a fire risk from catalytic converter overheating.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P02A0 to identify the root cause.
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Quick Info
Category
Powertrain
System
Fuel Injection System
Difficulty
Type
Generic (SAE)
Recommended Tools
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