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Car failed emmsion test - 1999 Chrysler 300M

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It failed the test and you didn't have any check engine codes?

Was this a tailpipe test? What part did you fail? If you have high HC's than the car needs a tune up and a injector leakdown test. The injectors start to leak when they are worn and can increase unburned HC's.

High CO emissions indicates incomplete combustion. A new air filter and a tune up can help with this. Air flow sensors going bad can sometimes add to this problem.

It is high NOx? That would be a catalyst problem and may require a replacement. Sometimes you can just run a fuel system cleaner through a fresh tank of gas to help clear things out. Ever heard of the product called "Guaranteed To Pass"?

If your engine is smoking like the rings or the valves are worn might need to rebuild or replace the motor.

If you have engine codes run them down to the bad components and replace them. O2 sensors are always suspect at times like this.

Good luck and be safe!

Posted on Dec 12, 2009


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Usually with this age of vehicle you can replace the o2 (oxygen) sensor and it will pass. Cleaning the MAF if it has one cant hurt either if you do it right.

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