Why Does a Buick’s ‘Check Engine’ Light Flicker On and Off?
Q. I have a 2004 Buick with 146,500 miles, and the service engine soon light comes on and off intermittently. The mechanic tells me the codes indicate catalytic converter failure. Estimates to repair have been between $1200-$1600 dollars. I lucked out this past October and the light went off and I was able to get an inspection sticker. Since then, it has come off and on several times. If it’s the converters, should I repair my Buick or trade it in? I like the car and it runs great, but it is going to need tires.
A. It is entirely possible the catalytic convertor is starting to fail. To bring the cost of the repairs down, you could look at an aftermarket convertor. This will be much cheaper than the General Motors part, but be aware that some aftermarket catalytic convertors have been problematic. Work with your repair shop to ensure that the replacement convertor will work properly.
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