Renewed complete exhaust system from manifold back on my 1998 mercury mountaineer. Now there is a P0420 code coming up. Anyone have any ideas ? Thanks

Asked by Longbowman Nov 21, 2015 at 11:21 AM about the 1998 Mercury Mountaineer AWD

Question type: Maintenance & Repair

Had all catalytic converters, sensors and pipes replaced by mechanic. Had a misfire code but took care of that. Now have a P0420 cade (catalytic converter efficiency below standard bank 1) . Mechanic is now talking about injectors. Any ideas would be gratefully appreciated.
Thanks

2 Answers

Longbowman answered 8 years ago

Thanks Tom. The exhaust system needed to be replaced anyway and it was better to do it now than in the middle of winter. The "check engine " light does not come on when there is a P0420 code and it sometimes runs a little rough when stopped at the lights. Do you think it could be an injector leak ? Thanks.

Mark helpful

Longbowman answered 8 years ago

Hi Tom, I have had a couple of other mechanics diagnose the problem and most only use a simple OBD II code reader which of course gives the same results as I get. One charged $87 and had the car for a day to get the same result so I'm a little skeptical of their ability. I am thinking I will try testing the injectors next and move onto the vacuum hoses after that. Thanks for your time, I appreciate it.

Mark helpful

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