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also from exhaust come noise.
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o2 sensor been replaced
Moderators: IMOC Moderators, IMOC Committee Members
JAAASH wrote:Error code 21 is Oxygen Sensor Signal.
The problems you're describing sound like the knock sensor is dead.Have you reset the ECU since replacing the O2 sensor?
Tomas_St wrote:problem is sorted out now.spark plugs was a problem