Skip the auto shop - Our mechanics make house calls

Q: P0420 P0430 trouble codes

asked by on

I recently changed out the o2 sensors in my car do go an oil leak that also got into the exhaust but I didn't drive it for more than a few miles due to the fact it was smoking so I fixed the leak and changed the o2 sensors and if fixed that problem but not the P0420 and P0430 codes are coming up do u think it could be the sensors I used (universal ones) or maybe I did some thing wrong or is it because of the oil got into the exhaust and clogged the catalytic converters

My car has 150000 miles.
My car has an automatic transmission.

A: Hello. Thanks for writing in. The universal...

Hello. Thanks for writing in. The universal oxygen sensors, a bad connection, or a bad catalytic converter can all be the cause of the codes. If you can you access to a known good oxygen sensor and test it in the vehicle, then you can rule out that as an option. Universal oxygen sensors are fairly new to the market and may have faults. You will also want to check the connection to the sensors to make sure they are clean, dry, and tight. If the oxygen sensors have been proven to be ok, then you are likely looking at a bad catalytic converter. You should test the oxygen sensors and the connections first before resorting to inspecting the catalytic converter.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
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・Save up to 30%

Get a quote

What others are asking

Q: Thermostat leak

Hello, I have come across this many times on this vehicle. You will need to replace the thermostat housing as an assembly to stop the leak. These begin to leak because the plastic warps and no longer seals. You would...

Q: how many camshaft positioning sensors and location?

Hello. Your vehicle should be equipped with four different camshaft position sensors, one for each of the engine's camshafts. They are mounted in the front of the cylinder heads, near the camshaft actuators, across from each other. The sensors should...

Q: Weird sound and shaking as well as lower gas mileage and poor acceleration

It sounds like you may have a clogged catalytic converter. As you may already know, the catalytic converter converts toxic exhaust gases into less harmful pollutants that are suitable to be expelled into the atmosphere. When this is clogged, this...

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...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...