yea unless a replacement o2 sensor is in that price I would definately fight it. to diagnose it all they would do is plug their reader into your computer port and press a button, and if i is wrong it takes less than a minute to plug it back in. like what was mentioned earlier it's on the downpipe of your exhaust usually less than a foot from the block. If you go to an autozone i believe they have a deal where they diagnose the problem for free, it takes only a minute and may help you out.
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