Q: Q: Check Engine light; catalytic converter

asked by on

The Check Engine light is on. It indicates that the catalytic converter needs replacing.

When a catalytic converter begins to fail, the computer will give a reading of the code P0420 and/or code P0430 which pertains to catalyst efficiency. The catalytic converter is, in a way, like a metal filter that traps toxic gases from leaving the combustion chamber, preventing them from entering the atmosphere. This is monitored by your Ford’s computer with the up and downstream oxygen sensors. If these oxygen sensors detect an error of some sort, a code will pop up in the computer. However, this does not always mean that the converters are failing. A worn out ignition system, faulty oxygen sensors and even bad gas can duplicate these codes as well. To be 100% certain that the catalytic converter is the problem, I would recommend enlisting the assistance of a certified mechanic to come by and inspect your Ford Expedition. They will have the experience and tools needed to determine if the problem lies with the catalytic converter or if the problem lies elsewhere. Once the cause is identified, they will be able to assist you in replacing your catalytic converter if necessary.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Q: Check Engine light; catalytic converter

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Ecu problem wanting to make sure

You need to have some of the codes like the first three diagnosed using the proper pinpoint tests until a problem is found. You may have an electrical harness short or a cut that is causing all the codes. Only...

Q: Where is the power steering pressure switch located on a 2003 Nissan sentra 1.8l?

The power steering pump pressure switch is located on the pressure hose just before the connections to the rack and pinion steering system. If you need further assistance with your power steering system, then seek out a professional, such as...

Q: Car is tapping

Occasionally, belt driven accessories are the source of noise so you can try to isolate all belt driven components by removing the serpentine belt and briefly run the engine. If the noise remains, a common source of tapping is the...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...