OBD-II Generic Error Code P0204: How to Fix It

Q: Can I drive with P0204 error code?

You should not drive with P0204 for extended periods. While the vehicle may run, it will operate on 3 cylinders instead of 4, causing poor performance, increased emissions, and potential damage to other engine components like the catalytic converter.

Q: How much does it cost to fix P0204?

Repair costs vary widely depending on the root cause. A faulty fuel injector replacement typically costs $150-400 including parts and labor. Wiring repairs may cost $100-300, while PCM replacement can cost $800-1500.

Q: What causes cylinder 4 injector circuit malfunction?

Common causes include a failed fuel injector, damaged wiring harness, corroded electrical connections, blown fuse, or rarely, a faulty PCM. Age, heat, and vibration are the main factors that lead to these component failures.

Q: Will P0204 cause my car to fail emissions testing?

Yes, P0204 will typically cause an emissions test failure because it affects the air-fuel mixture and can trigger the check engine light. The code must be resolved and the monitor readiness status complete before passing emissions testing.

Q: How do I know if the fuel injector or wiring is bad?

Test the injector resistance with a multimeter (should be 10-17 ohms typically). If resistance is correct, check wiring continuity and power supply. A swap test with another cylinder's injector can also help isolate whether the injector or circuit is faulty.

Abstract

Error code P0204 indicates a malfunction in the fuel injector circuit for cylinder 4. This can cause poor engine performance, rough idling, decreased fuel economy, and potential engine misfires that need immediate attention.