SOURCE: Code P0420
P0420 Catalyst System Efficiency Below Threshold (Bank 1)
There is one 02 sensor in front of the catalytic converter (called upstream), and one behind it (downstream). When the engine is warmed up and running normally the upstream oxygen sensor reading fluctuates and the downstream one is fairly steady. In the case where both readings are fairly steady, a P0420 check engine light code is set.
Possible Causes:
Oxygen (O2) sensor not working correctly
Damaged or leaking exhuast (pipe, manifold, catalytic converter)
Damaged catalytic converter
SOURCE: Scan tool will not erase code # P-0601/2001 chrysler sebring 2.7
Sounds like a bad PCM.A dealer may be able to reflash the thing but not certain.Do a web search for the above code and you'll get all kinds of info. Good Luck
SOURCE: check engine light p0300, p0420 & mtv solenoid makes noise
P0300
1.ignition system fault spark plug ign wire coil.
2.vacuum leak, inj fault.
3.high or low fuel pressure.
P0420
1.catylist eff low bank1- cat can be defective.
2.eng misfire, vacuum leak.
3.engine oil leak into the exhaust valve guide seals.
as for the warranty i dont know.
SOURCE: cod p0420
P0420 is a catalytic converter inefficiency code.
Basically the cars computer is looking at the rear O2 sensor to monitor the catalytic converters ability to properly reduce emissions. If the computer sees the rear O2 sensor acting differently than normal it interprets this as the cat no longer able to do its job and turns on the check engine light to make you aware there is an issue.
There are a few things that can cause this to happen. The most common is that the catalytic converter has gone bad and needs to be replaced.
The good news is the federal emissions warranty on these is typically 8 years or 80,000 miles. Sometimes longer if the manufacturer chooses. If you fall into this guideline call you local dealer and see if you are covered. If you are you will be able to have this replaced at no charge.
The bad news is if you are not covered than you will have to pay for it out of your pocket and they are not necessarily cheap. Do not go with anything but either the o.e. cat or a direct fit from a put able supplier. Anything other than these two options will leave you with more problems than they solve.
Let me know if you have any questions and I'll do my best to answer them. Thank you for using FixYa.com!
I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa
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