Mitsubishi P0171 Error Code: How to Fix It

Q: Can I drive my Mitsubishi with P0171 code?

You can drive short distances, but avoid extended driving. The lean condition can cause engine damage over time, including overheating and catalytic converter failure. Address the issue promptly to prevent costly repairs.

Q: How much does it cost to fix P0171 on a Mitsubishi?

Costs vary widely depending on the cause. Simple fixes like air filter replacement cost $15-30, while oxygen sensor replacement ranges $200-400. Major repairs like fuel pump replacement can cost $400-800 including labor.

Q: Will P0171 cause my Mitsubishi to fail emissions testing?

Yes, P0171 will typically cause your vehicle to fail emissions testing. The code must be resolved and the readiness monitors must complete their cycles before passing inspection.

Q: What's the difference between P0171 and P0174?

P0171 indicates a lean condition on Bank 1, while P0174 indicates a lean condition on Bank 2. If your Mitsubishi has a V6 or V8 engine and both codes appear, look for common causes affecting the entire fuel or air intake system.

Q: How do I prevent P0171 from coming back?

Regular maintenance is key: replace air filters every 12,000 miles, use quality fuel, replace fuel filters as recommended, and address vacuum leaks promptly. Keep up with scheduled oxygen sensor replacements and clean the MAF sensor periodically.

Abstract

The P0171 error code on your Mitsubishi indicates the engine is running too lean on Bank 1, meaning there's too much air and not enough fuel in the air-fuel mixture. This can cause poor performance, rough idling, and potential engine damage if not addressed. The most common causes include vacuum leaks, dirty air filters, faulty oxygen sensors, or fuel system issues.