2003 Silverado O2 Sensor Error Codes
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2003 Silverado O2 Sensor Error Codes - 5/21/2007 5:13:05 PM
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ericksob
Posts: 3
Joined: 5/21/2007
Status: offline
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2003 Silverado V8 5.3L
I'm looking for suggestions to eliminate my engine light from coming on. Signs are pointing toward the O2 Sensors, but I would like to confirm that before I put money into it. I have recently replaced the air filter and cleaned the Mass Air Flow Sensor as I learned those can sometimes lead to such engine codes. I've used a engine tech tool to gain the following data:
P0171 Bank 1 Fuel Trim System Lean
P0131 O2 Circuit Low Voltage Bank 1 Sensor 1
P1133 HO2/O2S Insufficient Switch Sensor 1 or Bank 1 Sensor
Additional "Freeze Frame" data at time of engine code trap:
Fuel System 1: Closed Loop
Fuel System 2: Closed Loop
Calculated Load: 1.9%
Temp: 192 degrees F
STFT Bank 1: 51.5%
LTFT Bank 1: 25.0%
STFT Bank 2: 0.0%
LTFT Bank 2: 5.4%
Intake Manifold Pressure: 10.9 in*hg
RPM: 558
Speed: 0 MPH
MAF Sensor: 0.72 lb/min
Throttle Position: 4.3%
Thanks!
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RE: 2003 Silverado O2 Sensor Error Codes - 5/22/2007 5:29:40 PM
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golfer
Posts: 610
Joined: 10/8/2006
Status: offline
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Kinda looking like the bank 1 sensor may need replacement but also check for leaks before the sensor.
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RE: 2003 Silverado O2 Sensor Error Codes - 5/22/2007 5:57:39 PM
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ericksob
Posts: 3
Joined: 5/21/2007
Status: offline
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Thanks...any idea of expected manifold pressures, or expected STFT and LTFT values. I believe they stand for Short Term Fuel Trim and Long Term Fuel Trim, but have no clue what they should be. That goes with most of the data from the "Freeze Frame" feature from the diagnostic tool I used (Innova 3120 CanOBD 2 in 1 Tool).
Does anyone know of a guide that details expected values for those outputs? The tool manufacturer doesn't seem to have any such thing.
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RE: 2003 Silverado O2 Sensor Error Codes - 5/29/2007 2:24:10 PM
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jiggsy
Posts: 29
Joined: 3/30/2007
Status: offline
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Got these from an official GM Service Manual. Hope it gives you somewhere to start ...
PO171
Conditions for Setting the DTC
The average long term fuel trim cell value is above 23 percent.
All of the above conditions are present for 6 seconds.
200 -800 mV
PO131
Conditions for Setting the DTC
Lean Test:
The PCM detects that the affected HO2S voltage parameter is
Less than 200 mV for 165 seconds.
Or
Power Enrichment Test:
The PCM detects that the affected HO2S voltage parameter is
less than 400 mV for 10 seconds.
P1133
Conditions for Setting the DTC
The PCM detects that the affected HO2S lean-to-rich or rich-to-lean
transitions are less than a calibrated value.
250-625 mV
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RE: 2003 Silverado O2 Sensor Error Codes - 6/6/2007 9:02:53 AM
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ericksob
Posts: 3
Joined: 5/21/2007
Status: offline
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Has anyone ever swapped out O2 sensors before? Are they difficult to access (from what I've seen they appear to be).
How about the need for any thread locking material?
Are they fragile...any thing to look for or be careful of?
Thanks!
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RE: 2003 Silverado O2 Sensor Error Codes - 6/6/2007 11:27:48 AM
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golfer
Posts: 610
Joined: 10/8/2006
Status: offline
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quote:
ORIGINAL: ericksob
Has anyone ever swapped out O2 sensors before? Are they difficult to access (from what I've seen they appear to be).Thanks!
Depends which ones ... if you have ones located near the maniflods by the fire wall then those are ackward.
quote:
How about the need for any thread locking material?
No ... actuallty you might want to use anti-sieze compound on the threads and only the threads don't get any on the sensing end.
quote:
Are they fragile...any thing to look for or be careful of?
Yes ... don't drop them or bang the sensing ends.
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