OBD-II Error Code P0117: How to Fix It

Q: What are the symptoms of a P0117 error code?

Common symptoms include poor fuel economy, rough idling, hard starting when cold, engine running too rich or lean, black smoke from exhaust, and the check engine light illuminating. The engine may also take longer to warm up than normal.

Q: Can I drive with error code P0117?

While you can drive short distances, it's not recommended for extended periods. The faulty ECT sensor can cause poor engine performance, increased emissions, and potential engine damage from running too rich or lean. Get it diagnosed and repaired as soon as possible.

Q: How much does it cost to fix P0117?

DIY repairs typically cost $15-50 for a new ECT sensor plus any needed coolant. Professional repair costs range from $150-300 including parts, labor, and diagnostic time. Costs vary based on vehicle make, sensor location accessibility, and local labor rates.

Q: What causes ECT sensor failure?

ECT sensors commonly fail due to age, corrosion from coolant contamination, electrical short circuits, physical damage from overheating, or manufacturing defects. Contaminated coolant and electrical connection problems are the most frequent causes.

Abstract

Error code P0117 indicates your Engine Coolant Temperature (ECT) sensor is sending a low voltage signal to the engine control module. This can cause poor engine performance, rough idling, and increased emissions. The issue is typically caused by a faulty ECT sensor, damaged wiring, or a bad connection.