OBD-II Generic Error Code P0118: How to Fix It

Q: Can I drive with P0118 error code?

You can drive short distances, but the engine may run poorly with incorrect fuel mixture and timing. The ECM uses default values which can cause poor performance, increased emissions, and potential engine damage if driven extensively.

Q: What causes P0118 error code?

Common causes include a faulty ECT sensor, damaged wiring or connectors, corrosion in the sensor circuit, or rarely, a failed engine control module. The sensor can fail due to age, heat cycling, or coolant contamination.

Q: How much does it cost to fix P0118?

DIY repair costs $20-50 for a new ECT sensor plus any wiring materials needed. Professional repair typically ranges from $150-300 including parts and labor, depending on whether wiring repair is needed.

Q: Will P0118 cause my car to overheat?

P0118 itself doesn't cause overheating, but it prevents accurate temperature monitoring. Your cooling fan may not operate properly, and you won't get accurate temperature readings on your dashboard gauge, which could lead to undetected overheating.

Q: How do I know if my ECT sensor is bad?

Signs include P0118 code, engine running rough when cold, poor fuel economy, cooling fan running constantly or not at all, and inaccurate temperature gauge readings. Testing with a multimeter will confirm sensor failure.

Abstract

The P0118 error code indicates your engine coolant temperature (ECT) sensor is sending an abnormally high voltage signal to the engine control module. This typically means the sensor thinks your engine is extremely hot when it's actually cold, or there's a wiring issue causing incorrect readings.