these are the two codes I'm getting from a 1995 Volvo 850 Turbo wagon...
do I need to replace the o2 sensors or do I have a another problem????
P0132 O2 Sensor Circuit High Voltage (Bank 1 Sensor 1)
P0137 O2 Sensor Circuit Low Voltage (Bank 1 Sensor 2)
reply w_reavis at hotmail dot com
thanks
First step is to check the wiring to the sensors and if the voltage is correct. If the front senser has problems it often gives an error on the rear sensor too, even if the rear sensor is ok.
Niels
The first code (p0132) almost for sure is a bad front oxygen sensor, although it could be the wiring as stated. For it to be the wiring, at least one of the signal wires has to be shorted to the +12 supply, not ground.
I posted it wrong both were low voltage
P0131 O2 Sensor Circuit Low Voltage (Bank 1 Sensor 1) P0137 O2 Sensor Circuit Low Voltage (Bank 1 Sensor 2)
Well, with the low voltage, there is greater possibility that there is a wiring problem, that's all.
And it is possible that the rear sensor is causing both codes as well. Measure the voltage between the gray and black wires going to the sensors with the sensors disconnected (easier said than done). It should be around .7 volts with the engine not running, but ignition on. (Only connect and disconnect components with the ignition off.) If the voltage is OK, then try a new front sensor. If that doesn't fix it, then you'll need to change the rear sensor as well. Note that many garages just change the front sensor without doing any diagnosis for this code.
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