hi,
i have an S40 2.0T 2000, had the "check engine" light and pulled out some P codes with OBD. please help me finding the parts need to be replaced or any DIY solutions as the dealers here are bloodsuckers!
here are the codes:
1. P0102 Mass Air Flow circuit low input
2. P0141 O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)
3. P0172 System Too Rich (Bank 1)
please shed a light here!
"check engine" light...P0102, P0141, P0172
"check engine" light...P0102, P0141, P0172
Last edited by pilototai on 21 Jul 2006, 03:58, edited 1 time in total.
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manicmechanic
- Posts: 1
- Joined: 25 August 2006
- Year and Model:
- Location: Canada
This is my 1st night on this forum, I am considering a 2001 S40, I suppose your question has been answered by now, but just in case....
I have no Volvo experience, specifically, but have a few certifications in diagnostics. Generally your oxygen sensor heating circuit pre-heats your oxygen sensor so it can do it's job more quickly at warm up. It may share a ground with the sensor circuit itself depending if your sensor has 2, 3 or 4 wires (most likely 3 or 4).
I started to detail how these codes are like all related, but the explanation was becoming a book. Likely there is only one problem. Do you know the difference between hard faults and active faults? Basically, a hard fault is when a component is bad, reads bad and no matter what you do, will always read bad. The computer picks this up like a burned out bulb (or heater) that is there all the time until corrected.
An active fault is usually a symptom of some other component that a hard fault makes happen. Rule of thumb is always repair hard faults 1'st. Then clear codes, test drive and see if any thing comes back.
If you can determine what wires are which in your oxygen sensor, see if there is power going to your heating circuit of the oxygen sensor. If there is, the sensor may be replaced, this may clear all other codes. If there is no power going to the heating circuit, problem may be wiring, fuse or pcm.
Hope this helps.
I have no Volvo experience, specifically, but have a few certifications in diagnostics. Generally your oxygen sensor heating circuit pre-heats your oxygen sensor so it can do it's job more quickly at warm up. It may share a ground with the sensor circuit itself depending if your sensor has 2, 3 or 4 wires (most likely 3 or 4).
I started to detail how these codes are like all related, but the explanation was becoming a book. Likely there is only one problem. Do you know the difference between hard faults and active faults? Basically, a hard fault is when a component is bad, reads bad and no matter what you do, will always read bad. The computer picks this up like a burned out bulb (or heater) that is there all the time until corrected.
An active fault is usually a symptom of some other component that a hard fault makes happen. Rule of thumb is always repair hard faults 1'st. Then clear codes, test drive and see if any thing comes back.
If you can determine what wires are which in your oxygen sensor, see if there is power going to your heating circuit of the oxygen sensor. If there is, the sensor may be replaced, this may clear all other codes. If there is no power going to the heating circuit, problem may be wiring, fuse or pcm.
Hope this helps.
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