Car Stumbles at idle.
HMMM OK CATALYST CONVERTER WILL NOT MAKE IT DO THAT PLEASE EXPLAIN LITTLE MORE WHEN WAS CAR LAST TUNED UP TELL ME WHAT KIND CAR YOU HAVE OK LET ME KNOW
2001 Nissan Altima 2.4L last tuned a week ago, replaced both o2 sensors!
replaced a spark plug because scanner told me too!
WHAT CODE DID THE SCANER TELL YOU OTHER THAN P0420 , HAVE YOU CHECK YOUR FUEL PRESSURE, TAKE YOUR MASS AIR FLOW SENSOR OF AND CLEAN IT OK LET ME KNOW BE CARE FULL WHEN CLEANING THE SENSOR OK
ROB NEVERS MITE HAVE A GOOD IDEA DO YOU HEAR ANY RATELLING FROM BOTTOM OF YOUR CAR IF YES THAT MITE BE THE PROBLEM OK
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SOURCE: 2000 maxima with 84,000 miles
the code means the converter on the side cyliner # 2 is not working like it should ,to check to be sure you need a scan tool and data from the front and rear o2 sesor cannot mimic each other if they do the converter is bad ,there are aftermarket converters for that car but they dont preform as well as the factoy one .
SOURCE: p0240 catalyst system below threshold bank 1
This code has plagued technicians nationwide. This code is set because the computer is not reading the proper signals from the O2 sensors. This could either be related to faulty sensors or just a weak catalytic converter. There is also other solutions where you can dampen the O2 sensor signal but it's extremely difficult for a do-it-your-selfer to do.
SOURCE: 2003 Nissan Murano MIL P0442, CAr also refused to
The catalyst may be broken up inside and restricting exhaust flow. This will also restrict the engine output.
SOURCE: code PO420 catalyst system efficiency below threshold
you may have a bad converter, its not cleaning the exhaust, but on the other hand a bad rear o2 sensor can also cause this problem,there is a wat to test but you would need a scan tool or scope,replace the other sensor, if light returns then replace the converter, no money lost, if you were to replace the converter the o2 sensors should also be replaced. you have 165000 miles it would be crazy not to replace sensor and install new cat, so basically your just doing it in 2 steps and may get lucky and not need a cat. good luck.
Testimonial: "Your information is exactly what I needed to know.I suppose I just did not want to spend the money for a cat. converter. Thanks again for your help. "
SOURCE: check engine light on
Diagnostic code produces P0420 catalyst system efficiency below threshold-Bank 1. Probable causes are listed as follows:
1-air leak in exhaust before rear 02 sensor, 3-Fuel system fault,
4-faulty catalytic converter.
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