Lincoln P0420 Error Code: How to Fix It

Q: Can I drive my Lincoln with a P0420 code?

Yes, you can typically drive with P0420, but your vehicle may fail emissions testing and fuel economy may be reduced. The catalytic converter isn't protecting the environment properly, so get it fixed as soon as possible.

Q: How much does it cost to fix Lincoln P0420 error code?

Costs vary widely: oxygen sensor replacement ($150-400), exhaust leak repairs ($100-300), catalytic converter cleaning ($20-50), or full catalytic converter replacement ($800-2000+ depending on your Lincoln model).

Q: Will P0420 code clear itself on Lincoln vehicles?

No, P0420 will not clear itself. You must fix the underlying issue and manually clear the code with an OBD2 scanner. The code may return if the problem isn't properly addressed.

Q: What causes P0420 in Lincoln MKZ and Navigator?

Common causes include failing oxygen sensors, catalytic converter wear from high mileage, exhaust leaks, engine misfires, contaminated fuel, or oil consumption issues that poison the catalyst.

Q: How long do Lincoln catalytic converters typically last?

Lincoln catalytic converters typically last 80,000-120,000 miles with proper maintenance. Highway driving, quality fuel, and regular oil changes help extend catalytic converter life.

Abstract

The Lincoln P0420 error code indicates that your vehicle's catalytic converter on Bank 1 is not operating efficiently, meaning it's not properly reducing harmful emissions. This is a common issue in Lincoln MKZ, Navigator, and other models that can trigger the check engine light and may cause your vehicle to fail emissions testing.