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

asked by on October 03, 2016

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

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

Catalytic Converter Replacement $279.51 - $3103.51 Get a Quote
Check Engine Light is on Inspection $79.99 - $89.99 Get a Quote

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.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

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

What others are asking

No throttle response until warm, then not very good.

Hi there. The EBPV (exhaust back pressure valve) is sticking or the EBP (exhaust back pressure) sensor tube is wet which freezes in the cold preventing the EBP sensor from seeing the increase in EBP as you attempt to throttle...

How do I turn the reverse wiper feature on or off?

When the reverse wiper feature is turned on, the rear window wiper will automatically start operating when you put your shifter in the R position, presuming the front windshield wipers are turned on. You can turn this feature on or...

The car idles fine. It revs up but slowly drops RPMs.

Hi there: The idle is controlled by the idle control valve, mass air flow sensor, and throttle body of a fuel injected motor. Any of these components could be dirty, damaged, or have faulty wiring that is causing your engine...

Miss fire

Engine misfires can be caused by many different problems and are generally caused by either a spark or fuel issue or in some cases, a combination of both. Spark related problems generally will result from things like ignition coils, crankshaft...

What can cause your car not to catch gear?

Based on your description, the problem could be in the engine, the transmission or both. If transmission related, it could be as simple as a low level of transmission fluid or as complicated as an internal fault in the transmission...

i have a knocking noise coming from under my feet on driver side by the tire and its a bottom knock right under the gas and brakes

Hi there. If your vehicle is a front wheel drive, then the noise could be a CV Shaft failing causing the knocking noise. If your vehicle is a 4x4, then the front driveshaft universal joints are worn and making the...

P0014 on scanner

Hi and thanks for contacting YourMechanic. The code p0014 refers to the camshaft position sensor 'B' circuit with the timing over-advanced. The TPS will not make the computer think of a cam not adjusting correctly. With the code p0014, check...

Car shaking and stalling

Hi. There are a lot of issues that could cause the symptoms you are having. One guess is that you may have a vacuum leak. A vacuum leak is basically unmetered air that enters the engine, disrupting the air/fuel ration....

Car shakes when at 40mph i added some trans fluid because it was missing some and thats when it started shaking

Hi there. The most common cause of this is a tire balance issue. I would typically start by checking the balance of the tires to see how they are. I would inspect the tires at the same time as a...

Related articles

P2066 OBD-II Trouble Code: Fuel Level Sensor “B” Performance
P2066 P2066 code definition Fuel Level Sensor “B” Performance What the P2066 code means P2066 is an OBD-II generic code for the engine control module (ECM) detecting the fuel level sensor “B” performance. The sensor output voltage is not accurate...
B1952 OBD-II Trouble Code: Seat Rear Up/Down Potentiometer Feedback Circuit Short To Battery
B1952 means a shorted circuit has been detected in relation to one of the rear seat's potentiometers, likely due to defective wiring.
P0342 OBD-II Trouble Code: Camshaft Position Sensor Circuit Low Input
P0342 means that the camshaft position sensor circuit on engine bank 1 is sending a reading that is outside the manufacturer's settings.