Check Engine Light questions
Thread Starter
On The Tree
Joined: Jun 2005
Posts: 113
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From: Bellevue, WA
Check Engine Light questions Ever since my track day 1.5 wks ago I've had a recurring CEL. I just assumed it had something to do with oxygen sensors. Car seemed to fun just fine. Well, I finally got off my lazy bum and hooked up my code reader. It kinda surprised me:
P0171 - System too Lean (Bank 1)
P0332 - Knock Sensor 2 Circuit Low Input (Bank 2)
Does anyone know what this could be? Simple fix or dealership visit?
Thanks!
BTW, I've NEVER heard any knocking at all.
P0171 - System too Lean (Bank 1)
P0332 - Knock Sensor 2 Circuit Low Input (Bank 2)
Does anyone know what this could be? Simple fix or dealership visit?
Thanks!
BTW, I've NEVER heard any knocking at all.
Knock Sensor retards engine timing and fuel trim I believe. Not sure they are related tho, seems it could be, but I would think the Bank 2 sensor would affect Bank 2, not Bank 1.
There are a few TSBs out for the P0171 System Too Lean, mostly to do with plugged injectors etc, I did a fast search and didn't see any that tied the two together.
But I am FAR from being a Tech.
I am sure one of the more knowledgeable guys will pipe up soon and give you a run down.
There are a few TSBs out for the P0171 System Too Lean, mostly to do with plugged injectors etc, I did a fast search and didn't see any that tied the two together.
But I am FAR from being a Tech.
I am sure one of the more knowledgeable guys will pipe up soon and give you a run down.
TECH Enthusiast
Joined: Nov 2005
Posts: 747
Likes: 18
Originally Posted by Crisisman
As for the lean code, check your MAF and clamps on the intake maybe??? Perhaps something is coming loose and letting a little extra air in?
Have a scanner of any sorts? Maybe able to read if it is getting any KR at all or what your fuel trims are sitting around? The van would shoot up to 12 in KR in no time, LTFT were constantly 22+ (lean) and his maf wouldn't read about 5,600Hz. Old man didn't believe me when I told him his MAF was bad and he got a new fuel pump.
Car seem to run fine? Doesn't fall on its face at all going WOT does it?
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Verdad Gallardo Thread Starter
On The Tree
Joined: Jun 2005
Posts: 113
Likes: 0
From: Bellevue, WA
Originally Posted by Rawr256
My dads van has thrown these codes and the MAF completely crapped out shortly after. Granted it is a 3400 V6, not a LS6, but still sensor related.
Have a scanner of any sorts? Maybe able to read if it is getting any KR at all or what your fuel trims are sitting around? The van would shoot up to 12 in KR in no time, LTFT were constantly 22+ (lean) and his maf wouldn't read about 5,600Hz. Old man didn't believe me when I told him his MAF was bad and he got a new fuel pump.
Car seem to run fine? Doesn't fall on its face at all going WOT does it?
Have a scanner of any sorts? Maybe able to read if it is getting any KR at all or what your fuel trims are sitting around? The van would shoot up to 12 in KR in no time, LTFT were constantly 22+ (lean) and his maf wouldn't read about 5,600Hz. Old man didn't believe me when I told him his MAF was bad and he got a new fuel pump.
Car seem to run fine? Doesn't fall on its face at all going WOT does it?
Car runs great. I reset the CEL and it hasn't returned yet.
