oxygen sensor problem

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Dec 5, 2008 | 08:28 AM

#16

fonefiddy

Cargo Master

Joined: Nov 2003

Posts: 2,585

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From: Duluth, Mn.

Try cleaning up the engine harness connectors. There should be 4 main connex. Sometimes they can corrode and cause poor, no connex. Mucho headaches when it happens.

Dec 5, 2008 | 09:57 AM

#17

Old93junk

Post Fiend

Joined: Nov 2008

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From: McKenzie River

I have got that 172 code stored in the memory, with no check engine light and no ill effects to performance or mileage. my CEL is functioning correctly how come the code is still there?

Dec 5, 2008 | 11:54 AM

#18

skaterbro

Senior User

Joined: Aug 2007

Posts: 364

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From: Ca

Quote:

Originally Posted by einsteindog

Replaced the fuel filter. Took truck for a ride. CEL came back on(would miss it if it wasn't there). Ran the code. Not only did 172 come up again but nowcode 157 MAF low voltage is showing up.

Have you checked the FPR? My guess is either that or, as Conanski said, a fuel pump that's at fault.

Dec 5, 2008 | 11:57 AM

#19

einsteindog

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I checked the fuel pressure, everything within specs. Checked the FPR checked out ok. I'm leaning toward a sensor,maybe wrong.

Dec 5, 2008 | 11:58 AM

#20

skaterbro

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Joined: Aug 2007

Posts: 364

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From: Ca

Quote:

Originally Posted by Old93junk

I have got that 172 code stored in the memory, with no check engine light and no ill effects to performance or mileage. my CEL is functioning correctly how come the code is still there?

Did you clear the code when you fixed the problem?

Dec 5, 2008 | 12:01 PM

#21

einsteindog

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yes I cleared the code. Came right back within a few minutes of driving. Think it misses me.

Dec 5, 2008 | 12:01 PM

#22

skaterbro

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Joined: Aug 2007

Posts: 364

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From: Ca

Quote:

Originally Posted by einsteindog

I checked the fuel pressure, everything within specs. Checked the FPR checked out ok. I'm leaning toward a sensor,maybe wrong.

So no fuel when you pulled the vacuum line? And you're sure your vacuum lines are intact? Check em all.

edit: doh einstein, notice who i quoted when i asked the "code clearing" question?

Dec 5, 2008 | 12:11 PM

#23

einsteindog

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No fuel in vacuum line.

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Dec 5, 2008 | 12:35 PM

#24

fonefiddy

Cargo Master

Joined: Nov 2003

Posts: 2,585

Likes: 1

From: Duluth, Mn.

There is a TSB about the engine wiring harness's. Try it.

Dec 5, 2008 | 12:46 PM

#25

Conanski

FTE Legend

Joined: Jun 2006

Posts: 31,930

Likes: 1,499

From: Ottawa, Ontario

Quote:

Originally Posted by einsteindog

Ran the code. Not only did 172 come up again but nowcode 157 MAF low voltage is showing up.

So now you have a lead. Code 172 doesn't really tell you anything it just says the motor is running lean. Code 157 is pointing at a specific sensor that is not behaving correctly and could cause your problem. Test it if possible or replace.

Dec 5, 2008 | 04:45 PM

#26

EPNCSU2006

Lead Driver

Joined: Nov 2002

Posts: 9,557

Likes: 44

From: Concord, NC

A dirty MAF sensor is likely to cause a lean condition, so clean the tiny heating elements with a shot of electric contact cleaner and see if it makes a difference.

Dec 12, 2008 | 10:55 AM

#27

einsteindog

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Tried cleaning the MAF sensor.One of the sensors is dirty and won't come any cleaner. Should I just replace it?

Dec 23, 2008 | 01:25 PM

#28

einsteindog

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Replaced the MAF sensor. Erased code. Took it for a ride , Wouldn't you know it CEL came back on with code 172

. Might just let the mechanic get the headache.

Dec 23, 2008 | 08:09 PM

#29

Maniac

Junior User

Joined: Dec 2002

Posts: 66

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Go back to the beginning of your problem and check the connection of your cables - reclean and retighten.
You may want to check for correct voltage at MAF and/or computer. Some one else would have to tell you exactly where and what votage to expect since yoiu have a new system than what I have on my '92.