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It doesn't really make sense. I don't think the o2 sensor is your problem. If the car was cold when you started the ECM does not use o2 sensor feedback until the car is warmed up. The o2 sensor should come online in 30 seconds to a minute. And I really hope he's not saying it's the rear o2 sensor(after the cat) since this sensor has very little effect on engine performance. It's only to monitor catalytic convertor operation.
Can you give us the fault codes in the ECM??
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1995 Tsi AWD
307awhp@24psi
Track numbers coming soon.
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