Codes P0420, P0430, P054A and P054C

Question

Good afternoon Scott.

Thank you for time. I have a 2016 Lincoln Navigator with the 3.5 V6 Ecoboost.

My check engine light come out. I connect my scanner which is very basic one and said that I have codes Codes P0420, P0430, P054A and P054C.

I know P0420 and P0430 are about my catalytic converter and I need to replace the right side plus the Oxigen Sensor and the Hego Sensor. Which I am planning on I just bough the sensors now I am saving to buy the right side catalytic converter.

What about the P054A and P054C codes? Are those relate it to the other 2 previous codes? Should I be concerned or worry? What can they be? Whats the solution?

Is my daily driver and I drive 200 miles per day 5 times a week.

Thank you,

Chuck Tobias · Accepted Answer

Posted by: @flavioca I know P0420 and P0430 are about my catalytic converter and I need to replace the right side plus the Oxigen Sensor and the Hego Sensor. Which I am planning on I just bough the sensors now I am saving to buy the right side catalytic converter. Have you researched and checked the possible causes of those codes? They don't single out defective parts they tell you a condition exists that requires further diagnosis.

Justin Shepherd · Answer

Posted by: @flavioca

My check engine light come out. I connect my scanner which is very basic one and said that I have codes Codes P0420, P0430, P054A and P054C.

I know P0420 and P0430 are about my catalytic converter and I need to replace the right side plus the Oxigen Sensor and the Hego Sensor. Which I am planning on I just bough the sensors now I am saving to buy the right side catalytic converter.

You more than llikely replaced the catalytic converter without actually troubleshooting, first. Catalytic converters don't "run out". They're designed for the lifetime of the car. You either had some kind of exhaust leak, or one or both oxygen sensors were bad. Oxygen sensors are on both sides of the converter to gauge the efficiency of the catalyst. Simply loading the parts cannon and hoping it works is a recipe for pulling hair out, especially when you're talking catalytic converters, that's $1800 for just one!