I took it to get a diagnostic and it read downstrem fluel tim system 1 rich or lean The ECM has tected a fault with the downstream 02 sensor probable cause - exhaust leak near 02 sensor or failed 02 sensor or fuel contamination. I put in chevron highest grade gas and fuel injection cleaner and light is still coming on. what is the fix and cost?
Replace sensor...also this car has a duel cam and if timing belt breakes the engine will be toast and is rediculously hard to work on.....sell sell sell
SOURCE: CHECK ENGINE CODE P0171
there is only one bank on a pt cruiser and yes it could be a fuel pump or a vacuum leak
SOURCE: I have pt cruiser showing mulfunction cersor light
Thought that the PT Cruiser wanted 87 Octane fuel....Your extra expense outlay will hurt nothing but your wallet.
Fill it up again. Be sure the tank is FULL. Restore the gas cap and give the vehicle 2 or 3 days to restore the "check engine" light. Malfunction Cursor is not (normally) in Crysler's auto maintenance software!!
If you continue to get the display - take it to Autozone and they will do a diagnostic on it for free - and TELL YOU what is wrong.....
SOURCE: 420 code catalyst system efficiency below
You could have an enefficient converter. Question is what caused it to go bad? I have attended seminars on code 420, Possible causes are lack of spark or clogged fuel injectors. there have been times where the spark plug wire lays on the engine and over time it wears a weak spot in the side of the wire, its not enough to throw a miss fire code but it keeps the full amount of spark from getting to the plug and not burning the all the fuel in the cyl. A leaky injector would also cause to much fuel to be deliverd into the cyl and not get burned.
Hope this helps.
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