Cel shows 4 codes. Maf and 3 O2 sensors. All happened at one time. What could do this?

Tiny
LITTLEMONEYMAKER
  • MEMBER
  • 2003 CHEVROLET SILVERADO
  • 139,000 MILES
Went to autozone. Cel showed 4 codes. Mass air flow and 3 o2 sensors. All at one time. What causes this?
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Tuesday, September 6th, 2011 AT 12:58 PM

11 Replies

Tiny
WRENCHTECH
  • EXPERT
What are all the exact code numbers?
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Tuesday, September 6th, 2011 AT 2:14 PM
Tiny
LITTLEMONEYMAKER
  • MEMBER
Thanks for the reply! I dont know the exact codes but they were for the 2 o2 sensors on the manifold and 1 near the converter. I did however check my pcv valve and it does not rattle so it could be bad. Would a bad pcv valve cause those codes to show?
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Tuesday, September 6th, 2011 AT 3:49 PM
Tiny
WRENCHTECH
  • EXPERT
There are dozens of possible different codes. We need the code numbers to be able to help you.
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Tuesday, September 6th, 2011 AT 3:51 PM
Tiny
LITTLEMONEYMAKER
  • MEMBER
The codes are.P0101
P0131
P0137
P0157
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Tuesday, September 6th, 2011 AT 5:43 PM
Tiny
WRENCHTECH
  • EXPERT
Those are all low voltage codes for the 0/2s and a generic code for the MAF. It's indicating a lean condition probably caused by something with the MAF. Check it thoroughly for any air leaks between the MAF and the throttle body and if none found, try cleaning the sensor wire in the MAF with some MAF cleaner
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Tuesday, September 6th, 2011 AT 6:05 PM
Tiny
LITTLEMONEYMAKER
  • MEMBER
Will do! You guys reply quick! Ill let you know something.
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Tuesday, September 6th, 2011 AT 6:22 PM
Tiny
LITTLEMONEYMAKER
  • MEMBER
I checked the between the points and could not find a leak so I cleaned it with maf cleaner. The light went off when they checked the codes earlier so only time will tell now
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Tuesday, September 6th, 2011 AT 7:01 PM
Tiny
WRENCHTECH
  • EXPERT
You could have other issues with the MAF but always try cleaning first.
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Tuesday, September 6th, 2011 AT 7:04 PM
Tiny
LITTLEMONEYMAKER
  • MEMBER
Would you recommend buying one at a junkyard if need be?
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Tuesday, September 6th, 2011 AT 7:08 PM
Tiny
WRENCHTECH
  • EXPERT
No, you don't want electronic components that have been sitting out in the weather. The problem could just as easily be in the wiring or the PCM itself.
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Tuesday, September 6th, 2011 AT 7:10 PM
Tiny
LITTLEMONEYMAKER
  • MEMBER
By the way, truck is getting about 12 mpg and ran rough upon start for about 2 weeks. I ran a couple of high octane gas through it and stopped the rough start and idle but gas mileage is still bad and is sluggish for the first few minutes after start
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Tuesday, September 6th, 2011 AT 7:11 PM

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