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I took my car to jiffy lube, 2004 dogde stratus, 2.4 l , to get my 02 sensor replaced. Now my ingine light is on the code was PO420. I wonder now if he kept my new sensor and never replaced it with the new one. When i took it to autozone to check my ingine light they say its my catalystic converter. My converter might be operating below efficiency, or below threshold. Should i take my car to the dodge dealer for a engine diagnostic? I dont no what to do. I need some help please. Thank you any advice is greatly appriciated.

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Alot of times an in effective catalyst code and an O2 sensor code can be set from an engine vacuum leak. Engine sensors can not see a vacuum leak, but they can tell when an engine is running lean and associate it with the emission system. My suggestion is to have your mechanic look for a bad vacuum hose or elbow.

Posted on Nov 14, 2014

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