mikeswrx02

Hi all and help if anyone,

P0171 system too lean(bank 1)??!!
Any1 knows what bank 1 means?

Engine light came on day 1 and rest then happening again in day 2!!!

Both read P0171 bank 1.

Since engine light started, the engine idling like it wants to die out every time i stop at a junction.

Used to stay steady at about 700rpm when warm, now always bouncing 500-700 at idle.

No mods recently, but had decat, hks dump and tek 3 remap done 2 yrs ago by BR.

I know ppl says maybe maf or lambda etc...
Any other info/advise??!!

Cheers in advance.
regards Mike

scoobyboy

bank 1 is drivers side i think so could be leaking manifold gaskets

mikeswrx02

Thanks for your reply.

How do i find out if leaking manifold?!

Bob Rawle

P0171 is fuel trim malfunction (too rich)

Means the front oxy sensor is dead, bit expensive to replace but only a Subaru part will work. Its a pseudo wide band sensor.

best regards

bob

mikeswrx02

cheers Bob,
It it the one located on the lower end of the downpipe?

Bob Rawle

Hi no its the one located in the headers just under the engine, the rear one is just a narrow band and has no affect on the fueling.

cheers

bob

scoobyboy

ahh you mean the air/fuel sensor subaru actually call it an ayf sensor the rear most sensor is the 02 sensor

Bob Rawle

Both sensors measure the oxygen content of the exhaust gas whatever Subaru call them.

The correct Subaru description is "Front oxygen (A/F) sensor" fwiw taken directly from the manual's.

Bank one is drivers side bank two is passenger side.

Bob

mikeswrx02

How much will it likely to cost and is it just cut the original wires and solder the new one on?

Turbotits

iTrader: (2)

No comes with a new plug and lead and is plugged in near the o/s suspension turret near the boost soloniod. There not cheap.Think i was quoted £240 or something like that.

I think its also worth checking your boost pipes are all secure for gauges etc. I had this code and rough running on a car that had blown the boost pipe off a turbo timer.

mikeswrx02

WWWHHHAAAATTTT £240???!!!!!! Is that £240 inc labour? if so how much just the parts?

Will do a check all over engine this weekend.

'Boost pipe off a turbo time' ...hmmm, never heard of a turbo timer requiring a boost pressure!!!

Rice Rocket

iTrader: (23)

would this sensor cause the car to run rough and skittery if it was onits way out?

Thanks
ps sorry to hijack!

mikeswrx02

I FIXED it!!!!!!
Looking at the engine bay for any signs of loose pipes/connections and BINGO , found the HKS BOV vacuum filter had split apart!!! Bought new one and the car is back to normal. What a relief!!!!!!!!

Thanks all for your infos.

Turbotits

iTrader: (2)

coooool