OBD2 Error Code P0204: How to Fix It

Q: What causes OBD2 error code P0204?

P0204 is caused by electrical problems in the cylinder 4 fuel injector circuit, including faulty injectors, damaged wiring, corroded connectors, or ECM issues.

Q: Can I drive with P0204 error code?

You can drive short distances with P0204, but prolonged driving can cause engine damage, poor fuel economy, and catalytic converter damage due to unburned fuel.

Q: How much does it cost to fix P0204?

Fixing P0204 typically costs $50-150 for DIY repairs (injector replacement) or $200-500 at a shop, depending on whether it's a wiring issue or injector replacement.

Q: How do I test a fuel injector for P0204?

Test fuel injector resistance with a multimeter (should read 12-16 ohms), check for power and ground at the connector, and perform a swap test to isolate the problem.

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

Yes, P0204 will likely cause your vehicle to fail emissions testing because the malfunctioning injector affects air-fuel mixture and increases harmful emissions.

Abstract

OBD2 error code P0204 indicates a malfunction in the fuel injector circuit for cylinder 4. This means the engine control module (ECM) has detected an electrical problem with the injector wiring, connector, or the injector itself, which can cause rough idling, misfires, and poor fuel economy.