Hello everyone, i have a 2001 Volvo s80 with 112k miles on it. one day as i was driving it check engine light came on got the code read and i got two codes. one for o2 sensor and a p0300 (random miss fire). when the car is in park it shakes, has a "boom boom boom'' noise coming from exhaust( guessing its the miss fire) revs up normally. The big problem is when car is put into gear it shakes even harder and will rev up to 3,000 rpm but car wont move even though it has grabbed the gear. i have checked spark plugs all but one were good the one smelling and being drenched in left over gas. i changed ignition coils, spark plugs, 02 sensor and cvvt. turned car back on still does the same thing. no service message shows up on dash.can someone please help.

 

Is this the twin turbo model by chance?

 

no it is a non turbo

 

I know that the oxygen sensors on this model will cause a rough running engine. The one that I recalled was a twin turbo and it had an oxygen sensor in each exhaust manifold. Basically Volvo engineered two inline 3-cylinder engines.

Start with the oxygen sensor. That is probably your problem. I hope it is the upstream sensor since the downstream sensor requires removing the catalytic converter to change.

 

Sorry for not updating post but i have changed o 2 sensor turned car on and still could hear and got same misfiring including power loss when in gear. i did some research and concluded i was going to reset my ecu once followed given procedures of removing ecu and putting it back ect... the car now only cranks but engine wont turn on.