Question about 2001 Volvo S40
Normally its the 02 sensor nearest the manifold ( the first one). However I would be carefull before you throw to much money at this fault as these engines are also fitted in the Mitsibushi and are prone to decoke issues and faulty throtle body I have had experience with both types and after spending lots of money on both occasions ended up selling cars at auction as neither main dealer could solve.You can check the o2 sensor by using a multi metre where by the reading should fluctuate if the 02 sensor is working correctly. You can also clean the throttle body intake and see if this helps. Good luck.
Posted on Sep 07, 2009
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Posted on Jan 02, 2017
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