2005 Mercury Marquis Repair Question

Topics covered: Battery, Battery cable, Catalytic converter.
Mileage: 40,000 miles.

Asked on November 8, 2012

Mercury Marquis Battery Problem

Changed the catalytic converter and now my check engine light stays on

Replied on November 8, 2012

If you haven't reset it, try that. If you did, check for new codes. Something may be wrong with an O2 sensor.

Answered by Jacobandnickolas (expert)
57,475 answers provided

Replied on November 9, 2012

Are you talking about resetting the computer?? Is this done by disconecting the battery cable ???

Response from punchinella123
3 questions asked