After sevewral attemps to correct, I was given a cost to explore in depth why this light stayed on, keeping me from getting the car smogged so it could be reregistered. The cost was $330. I was told I needed three parts for $168. I brought it in again when the parts were available and they were changed. I was apprehensive about what the labor charges would be. There was no charge for labor, so I'm pleased. Now if the check engine light will stay off long enough for me to get it smogged I'll be very happy.
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