On a Lincoln LS 2001, I'm having problems passing smog.
It all started when a mech replaced my sparkplugs due to an oil leak due to a faulty oil gasket. Then the mech installed one of the plugs crooked within the threads, so had to replace them again, this time by myself, after rethreading the head. Now, engine light went off for a while, but came back on. I'm thinking bad cat or bad sensor.
I've been driving with the engine light on (with the faulty spark plugs) for awhile so I'm thinking a lot of unburned fuel may have caused a clog in the cat.
But before splashing more dough on a brand new cat, would it be advisable to first spend 60 bucks on a new O2 sensor?
Get a free DTC scan at Auto Zone,or Advance Auto.You can also buy a inexpensive scanner for your model and go to www.obd-codes.com for the complete list of all the causes,most listings at this site are simple maintenance repairs that should be done anyway.
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