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CEL back on after replacing o2 sensor S70 1999

Thanks for weighing in Klaus. Hope you read all my posts, if not yes I had a vacuum issue. Still showing P0135. I cleared it before I took a long trip 2 days ago, it was all hwy, and got 26mpg. Got ready to leave and CEL came back on.

Rechecked and I'm still getting the closed loop error sending the CEL light on the second start. Any suggestions on how do I get the darn thing to clear since all indications are that it's running well????






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