Having problems with your 1999 Lincoln Town Car ?

1999 Lincoln Town Car: This car runs and sounds like a diesel at speed after it warms up and the gas mileage has significantly declined. Tune up didn't help and now I am being told that the catalytic converters may be clogged. I am also told that sometimes after market converters may cause the O2 senser to give bad readings. What is your experience with after market converters with this car.

Posted / edited by AnonymousUser on : 16-07-2018

Answers :

There should be no difference in using an OEM or aftermarket cat to the O2 sensors-as long as it fits with no leaks, it will do exactly what an OEM cat would do, with a significant savings. When the pipes are dropped behind the cats, inspect for 'clogging'-although it does happen, your cats behind your 4.6 are not as prone to breaking up as the earlier generations of catalytic converters, so look yourself for proof that they are damaged. If you do replace the cats, the rear sensors only monitor the cats thenselves they do NOT affect the way the engine runs at all. You are being sold a bill of goods in my opinion.
I am in a similar position. I have replaced the cat, both o2 sensors and various other sensor and such still haveing problems and it's throughing the code for a bad converter. Which has been checked and i'm told it is fine. Now my mechanic is in the guessing phase and i don't have money to be guessing. I've talked to numerous people and no one seems to know what it wrong. It knocks and rattles and idles rough. I was told the same thing about after market converters and the check engine light. My light has been on since the new cat was replaced and it comes back on within a day of resetting it. I have talked to other people that have had the same problem, if there is nothing wrong with my cat why the code for a bad one. doesn't make since to me. Hope you got/get your problem fixed.....im still at square one, very frustrating.
Repair Help & Product Troubleshooting for 1999 Lincoln Town Car

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