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No way to tell for sure without further tests. If the vent valve is faulty, replacement may fix the problem (valve and labor to do this will be the cost - estimate approx. $200). However, a number of other problems can cause this DTC so it is best to get a realistic estimate from a dealer.
You need to have it solder or change the cluster. If you change the the cluster you'll have to program it. My Buick did the same thing and I had someone solder my cluster and it worked ever since I fixed it.
The 'check engine' light is reserved only for Powertrain problems that could have an impact on the emissions systems.
what the OBD system looks for depends on the make, model and year. The
original systems varied widely in their capabilities.
Some did little more than check whether the
various electronic sensors and actuators were hooked up and working.
I suggest scanned the PCM computer (Powertrain COntrol Module) to know exactly what fault code is stored there.
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the catalytic converter most likely is no the sorurce of the problem, older design bead type Cat converters used to plug, but it is very rare on the newer ceramic honeycomb cats, u need to have the electronic engine control tested, are u getting a check engije light? if not has the fuel filter been replaced every 30,000 miles? also a part called the Mass Airflow sensor can cause these symptoms as well as igntion system problems.
I just wrote this for someone else too. If you're a handy person you can fix it yourself for about $12, it worked for me. All you need is a pack of resistors from RadioShack (On the computer chip there is a location that holds the 4-resistors that operate the odometer, they tend to fall off over the years, all you need to do is solder new ones on) and soldering gun. I did it myself and with this video's instruction and it only took me a little under an hour and $12.00. The most daunting part of it is getting the cluster out of the dash.
I need the fault codes. Without the codes I can't help, just to many possibilities. Have never heard of any fault code that cited Auxiliary emission control sensors" in my 35 years of emission repair on all makes and models. Sooooo... have the fault code(s) read again and write them down. Autozone does this test for free.