I apologise if this topic has been covered but i could not find any threads. I have a '89' jack running the 2.6l 4ze1 motor. I recently changed the oxy sensor due to the engine check light illuminating. Now that I have changed the sensor the jack lacks power during acceleration. I have also noticed the fuel consumption has gone from 13l /100kms to 24l /100kms. Can some body shed some light on this issue.
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