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Old 02-28-2010, 04:41 PM   #1
Scooby Specialist
Member#: 135297
Join Date: Dec 2006
Chapter/Region: South East
Location: Hampstead, NC
2002 Bugeye FTW!

Default CEL help....

ok i searched high and low, all thru the forums so forgive me if this has been posted already. I can only pay attention to 3455 threads and not the hole 56456346343 threads haha..

ok I have a AP v2 on a 2002 WRX.. Guy i bought the car from says it's on a stage 2 map.. (i've never owned an AP so thats why im asking here before i TOUCH anything) .... It's throwing a code P0171 System to lean (Bank 1) ... He said it was because of the intake, so we put the stock air box back on to see if the code would go away... dissconnected the battery, drove for 50+ miles and it came back on..

My question is i have an aftermarket uppipe,downpipe,turbo back exhaust,intake (which is currently replaced with the stock one so it would pass inspection) and an AP .. Should i just re-install the stock map to clear the code and stop the "lean" problem? I'm getting ready to drive back to TX so if that will make it run better i'll just mess with it when im back. Ive also been trying to stay out of boost as much as possible.. it's not stalling or running funny.

Again, forgive me for my weetardedness Please help! lol
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Old 03-01-2010, 01:36 AM   #2
Scooby Specialist
Member#: 203051
Join Date: Feb 2009
Chapter/Region: NWIC
Location: Portland, OR
2009 Outback


Lean means you either have not enough fuel or too much air. You most likely have a vacuum leak. If your running aftermarket exhaust and there was an issue it would be running rich. So I would look for any vacuum leaks after the MAFS. Looks for any small vacuum hoses that may be disconnected or cracked. One thing you can do is spray some brake clean around parts of the engine, the vacuum leak will suck in the fluid and the engine will start to run rough (from being too rich.) Just a little bit of this will not hurt the motor in any way. It is actually a diagnostic procedure we use at the dealer. Take a good look. Let me know what you find.
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