Fuel and air

P02A0 — Cylinder 2 Injector Restricted Flow

Severity: medium Drive with care, to a shop

What P02A0 means

The engine control unit monitors fuel trims and cylinder performance. P02A0 sets when the cylinder 2 injector delivers less fuel than commanded. That cylinder runs lean, which leads to misfires and lost power.

Symptoms

  • Check Engine light on
  • Rough idle
  • Misfires or stumbling
  • Reduced power and sluggish acceleration
  • Higher fuel consumption
  • Hesitation under load

Possible causes

  1. Clogged cylinder 2 injector from deposits
  2. Mechanical or electrical injector failure
  3. Low fuel pressure or a clogged fuel filter
  4. Damaged wiring or poor connection at the injector connector
  5. Intake air leak affecting the mixture
  6. PCM software fault or failure (rare)

How to diagnose

  1. Scan all codes and freeze-frame data, and note any cylinder 2 misfire codes
  2. Review short- and long-term fuel trims at idle and under load
  3. Test fuel pressure and check the fuel filter condition
  4. Inspect the injector connector and harness, and measure injector coil resistance
  5. Check the injector control signal with a scope or noid light
  6. Swap injectors between cylinders to see if the fault follows the injector
  7. Look for intake air leaks and run a cylinder balance test

Common fixes

  • Clean the injector (bench or ultrasonic cleaning)
  • Replace the cylinder 2 injector
  • Repair wiring or replace the connector
  • Replace the fuel filter or repair fuel supply parts
  • Fix any intake air leak

Questions and answers

What does P02A0 mean?

It means the cylinder 2 injector is restricted: the PCM sees less fuel reaching that cylinder than it commanded. A dirty or failing injector is the most common cause.

Can I drive with code P02A0?

Only for a short trip to get it checked. Extended driving with misfires can damage the catalytic converter and the engine.

Will an injector cleaner fix P02A0?

If deposits are the cause, professional cleaning of the injector often helps. If the problem is wiring or a failed injector, you'll need a repair or replacement.

This is general information about the code. The meaning can differ between makes and models: a scan tool and the repair manual for your car will show the exact cause.