hi again,not long bought s40 turbo,all was going great until...

started getting slight hesitation in accellerating from low revs and when taking foot off the gas to return to idle the revs drop and then jump back up to normal.sometimes the engine cuts out.but not often.then..

check engine light came on so i did a scan and found p0138 o2 sensor high volage bank 1 sensor 2and p0171 system too lean,had a quick look and all hoses and connectors ok.only thing i cant check is fuel pressure as i dont have a guage but fuel filter is probably original so thats gettin changed,anyone any ideas...thanks james

 

Make sure the idle motor hose is good. The hose goes from the intercooler over to the intake manifold.

 

hi,just checked that hose seem sound no craks or damage and hose clips all good.

 

A Bad O2 might cause that problem as well.

 

ok,would that cause the poor idle also or would that likley be the idle control valve itself?

 

You can clean the idle motor and see if that helps.
The O2 will also make it run rich and use more gas.

 

just changed fuel filter would say old one was original i think,full of black crap and alot more restrictive to blow through.engine light for now has went out by itself but weird idle thing is still going on.

 

Try clearing the codes and go from there.

 

hi,cleared faults this morning,drove to work approx 5 miles light back on again,sometmes cutting out coming down to idle,have got a oil leak at rear of engine which will be getting fixed tomorrow,oile has leaked all over the o2 sensor.do you think maybe that has knackered the sensor..cheers..james

 

Possibly but not likely. See what happens when they look at it tomorrow.