Volvo Repair: s40 check engine light, vacuum leaks, lean condition

Question
mark the code was po171.can you tell me how to re set service light on dosh to.thanks mike

Answer
    Mike, look at my past posts for service light reset procedures.
   Your code indicates a lean condition in bank one. This means you have too much air (or not enough fuel) entering bank one. Check for vacuum leaks first. Then test fuel pressure and volume. Lastly, the O2 sensor could be bad.

Mark