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Old 08-26-2003, 08:36 PM   #1
Rich L
Scooby Specialist
 
Member#: 961
Join Date: Feb 2000
Chapter/Region: Tri-State
Location: near Atco(NJ) 13.566@100.64-
Vehicle:
1999 RS-Tw/ CobraMAF
Custom Rallispec kit/IC#1

Angry Need help with CEL codes 170 and 141

Anyone have a clue what can trigger these codes?
I just replaced the primary O2 sensor.

170: is fuel trim malfunction bank 1
141: is O2 sensor heater circut malfunction (W.T.F.??)

My car has a split second fuel controller, (which is not as refined as a SAFC), 370cc RC injs. and runs a daily 6psi

The car runs very strong when "cold" ...with no problems...but not so when the motor is "warm" . I recently noticed some hessitation during moderate throttle while staying in boost for longer that a couple of seconds. Its as if the ignition started to cut off. Its much more subtle than hitting fuel cut on the rev limiter.

This is the first time I got these codes and am quite perplexed.
My gut tells me its probably the O2 sensor... but I dont know for sure.

Any theories or solutions?

Any help is appreciated.
-Rich L
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Old 08-27-2003, 01:50 AM   #2
Unsung Boxer
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Member#: 37196
Join Date: May 2003
Location: WA state
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funny you mention this, i am just learning about this at work.

the O2 sensor uses a built in heater to determine air fuel mixture. on RS's its the 2 white wires comming off of the secondary O2.. i believe this is the same situation w/ the primary o2 sensor as well.

Since your ECU uses the o2 sensor to determine fuel trim (minut adjustements in fuel mixture at X rpm), this would cause that circuite to malfunction as well.

my guess, a bad 02 sensor. I would take it to a shop for a more professional opinion, but hopefully that info is a start.

-Jake
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Old 09-01-2003, 11:48 AM   #3
Rich L
Scooby Specialist
 
Member#: 961
Join Date: Feb 2000
Chapter/Region: Tri-State
Location: near Atco(NJ) 13.566@100.64-
Vehicle:
1999 RS-Tw/ CobraMAF
Custom Rallispec kit/IC#1

Thumbs up

Thank you very much Jake.

Its makes much better sence to me now.

Im going to have it checked out... and will post a follow up.

Thanks again.

Rich L
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Old 09-01-2003, 12:13 PM   #4
snowrat
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Member#: 34041
Join Date: Mar 2003
Location: akron, oh
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I see that you have a 99. I had a check engine light for a bit and pulled the code. It was the 170 one. What the problem was that the maf? sensor that was recalled was never changed on my car. It was basically starting to go bad and was messing other things up. I would check that first. See if you had it changed or not.
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Old 12-02-2008, 08:16 PM   #5
Elitestuntz
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Member#: 128919
Join Date: Oct 2006
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Quote:
Originally Posted by Unsung Boxer View Post
funny you mention this, i am just learning about this at work.

the O2 sensor uses a built in heater to determine air fuel mixture. on RS's its the 2 white wires comming off of the secondary O2.. i believe this is the same situation w/ the primary o2 sensor as well.

Since your ECU uses the o2 sensor to determine fuel trim (minut adjustements in fuel mixture at X rpm), this would cause that circuite to malfunction as well.

my guess, a bad 02 sensor. I would take it to a shop for a more professional opinion, but hopefully that info is a start.

-Jake
Would that code 141 Heater circut malfunction cause the fans to stay on all the time???
I have having that same code on my 96 2.5 outback.
Fans stay on from the moment i turn the key, i checked the codes and cleared it, it came back with in 2 seconds it clicked and fans went right back on?????
anyone?
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