P0158 after cat passenger BUT what part number?

[Mikeee]

2003 Savana 5.3 2500 (6-lug)

 

OK, I'm getting the P0158 every 50-100 miles. The paperwork says it is the after cat passenger O2 sensor.

 

OK.

 

Now the hard part...what is the correct part number I should use? I go to RockAuto and they list 25+ part numbers. I want the ACdelco part but even THAT has multiple options. The actual part number on the actual sensor does not support the the numbers offered at RockAuto.

 

WTH ???

 

Somewhere I read it is best to replace the before and after cat O2s at the same time.

 

Any guidance to part number selection would be great.

[gmtech4]

2003 Savana 5.3 2500 (6-lug)

 

OK, I'm getting the P0158 every 50-100 miles. The paperwork says it is the after cat passenger O2 sensor.

 

OK.

 

Now the hard part...what is the correct part number I should use? I go to RockAuto and they list 25+ part numbers. I want the ACdelco part but even THAT has multiple options. The actual part number on the actual sensor does not support the the numbers offered at RockAuto.

 

WTH ???

 

Somewhere I read it is best to replace the before and after cat O2s at the same time.

 

Any guidance to part number selection would be great.

Do you diagnose this or only guessing ??? Just asking

[Mikeee]

Do you diagnose this or only guessing ??? Just asking

I have not had a full diagnostic done. I have a ScanGauge that does give me some freeze frame info but I have no skills to interrupt them.

 

Since this is my work van...if it is not moving I'm not making any money. Kinda hard to leave it for a day or so.

[Mikeee]

2003 Savana V/8 5.3

 

P0158

 

HO2S 22 Circuit High Voltage (Heated Oxygen Sensor Bank 2 Sensor 2)

– The PCM detects the HO2S voltage is above a predetermined range

 

Probable Cause

 

1. Oxygen sensor defective I'm guessing this is the cause.

2. System running very rich-check other codes first No other codes no other issues.

3. Engine misfire condition-repair. No other issues.

4. Fuel pressure very high-fuel pump or pressure regulator. Kinda doubt this.

 

 

My cats where recently replaced. Could the pre-cat be causing this?

[Duelin]

2003 Savana V/8 5.3

P0158

HO2S 22 Circuit High Voltage (Heated Oxygen Sensor Bank 2 Sensor 2)
– The PCM detects the HO2S voltage is above a predetermined range

Probable Cause

1. Oxygen sensor defective
2. System running very rich-check other codes first
3. Engine misfire condition-repair
4. Fuel pressure very high-fuel pump or pressure regulator