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I have noticed something like this on my S2 and in particular after I connected my O2 sensor back ( I am using the car without a CAT so I can connect/disconnect O2). At idle both closed loop operation controlled by the O2 sensor as well as engine rpm control loop may fight each other. As a result the engine idles off the 950rpm mark. It is possible that a faulty O2 (slow reacting sensor) will cause that. Anybody can confirm these?
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