Q: What is the best fix for a catalyst system efficiency below threshold (bank 2)

asked by on

i got a fault code reading of p0430 on my 2003 ford expedition

My car has 225000 miles.
My car has an automatic transmission.

Trouble code P0430 is for a catalyst on the drivers side. The sensor after the converter may be bad and not responsive enough or the catalyst itself may be bad.

The catalyst should be replaced if the converter rattles, there is a loss of power, or the spark plugs run richer on the drivers side more than the right passenger side of the engine.

If you’d like to have this fixed, consider YourMechanic, as one of our mobile technicians can come you, perform these checks, and diagnose the trouble code further in order to make an accurate repair.

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. What is the best fix for a catalyst system efficiency below threshold (bank 2)

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: What wires do I connect to the starter

The black and orange striped wire goes with the red wires behind nut with the big starter cable. The small, tan and red striped one goes to the small terminal. If you are still having trouble, a technician from YourMechanic...

Q: Fan sounds like it is hitting something.

Hi there. It sounds like maybe you have a bearing worn out on a pulley or the fan bearing may be worn out. This will definitely cause the pulley or fan to sound like if it hitting another component on...

Q: Stutters under acceleration or load, fine at idle

If there are no codes for a random misfire on any cylinder, the ignition control module - what the ignition coils are plugged into - is known for causing your eact symptoms. It can cause intermittent misfires. I suggest having...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
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...