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P0131, P0171 and P0301

Old 06-03-2014, 12:35 PM
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Default P0131, P0171 and P0301

Let me say in advance that I am not very computer savvy and I may not post this correctly even though I have read the rules. Please accept my apology.
I have a 2002 Volvo s40 1.9 turbo B4204T3 that has many problems but for now I just need to get the engine running well and the check engine light off. I have studied all of the Information that I could find and I also purchased a subscription of ALLDATA but I have had no luck finding specifications or fault tracing for the sensors, ECM and wiring.
Before replacing 1- MAP sensor (the one on the intake manifold), front o2 sensor and the 30650686 o2 adapter cable (as specified by the Volvo dealer) the DTC’s were P0101, P0107 and P0131. After replacing the MAP sensor, front o2 sensor, adapter cable 30650686, fuel filter and testing the MAF (the MAF sensor tested ok but the Volvo dealer said it needed to be replaced, I have not replaced it) the voltage to the front 02 sensor heater wires (the two white wires) is low, about 3.2v from the info. It looks like it should be batt. Voltage? DTC’s are now P0131, P0301 and P0171. I checked all fuses and all are ok. I could not find any vacuum leaks. The number 1 spark plug looks good and the wire tests good. I also removed the oil filler cap and found quite a lot of blow by exiting with the engine at idle. I placed a rag loosely over the fill hole and ran the engine again and it still misses at low RPM but always runs well and has lots of power at any speed above about 900 RPM. I cleaned and inspected the idle control valve and it appears to be ok but I don’t have any information on testing it. Fuel pressure is slightly low but ok (42 PSI) but I have not tested while driving, no fuel leakage from the fuel pressure regulator. Pressing the brake pedal does not make a difference in the idle. I have also cleaned the small crankcase nipple on the intake manifold by the power steering pump. The Idle Control Valve works at battery voltage but does not work when plugged in to the wiring harness turning the key switch on and off. I have also replaced the 30670269 crankcase vent nipple. I don’t have any electrical schematics to trace the o2 wiring and the coolant temperature sensor or specifications. This car has been rode hard and put away wet… A real beater, but I think it can be resurrected. I would appreciate any advice very much.

Thanks in advance,

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