P0202

Code P0202 indicates the engine control module (ECM) has found an electrical malfunction in the fuel injector circuit for cylinder 2. The ECM continuously monitors the voltage and current flowing through each injector's circuit. When cylinder 2's injector circuit readings are outside the normal operating range, this code is triggered and stored in memory.

Symptoms typically include a rough idle, noticeable engine vibration, and reduced power during acceleration. Because cylinder 2 isn't receiving fuel properly, the engine is effectively running on fewer cylinders, which creates an imbalance you can feel as shaking. Fuel economy will also suffer since the engine has to work harder to compensate for the lost cylinder.

Diagnosis starts with a visual inspection of the cylinder 2 injector wiring and connector. A noid light or multimeter can verify whether the ECM is sending the proper signal. The injector swap test is particularly effective here — move cylinder 2's injector to a different cylinder and see if the code follows. If it does, replace the injector. If the code stays on cylinder 2, focus on the wiring, connector, or ECM driver circuit. Most single-injector replacements are straightforward for experienced DIYers.

Severity

Symptoms

• •Check Engine light is on
• •Engine runs rough or misfires
• •Reduced power and sluggish acceleration
• •Higher than normal fuel consumption
• •Engine vibration felt through steering wheel or seat
• •Rough or unstable idle

Likely Causes

Estimated Cost

Common Fixes

1. Replace the cylinder 2 fuel injector
2. Repair or replace damaged wiring to the cylinder 2 injector
3. Clean or replace the injector electrical connector
4. Swap injectors between cylinders to isolate the faulty component

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