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Upon further discussion with the dealership it turns out that they need to do their own check engine test to ensure for themselves that it is the upstream 02 sensor causing the check engine light to come on. I had it checked for free at AAMCO. Then they said they will need to run various tests on the engine to ensure that the firing system and fuel system is performing properly to ensure that it is not causing a problem with the upstream 02 sensor and then and only then can they have confidence that the sensor has gone bad. The sensor itself is $131 dollars plus the cost of the check engine test and the cost of the diagnostics run on the engine itself...possible fixes...plus labor...could run the cost up as much as $400.00 worse case scenario.
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