2001 V60 2.4L non-turbo

O2 volts

Hey Guys,

I started getting a (P0032) Ho2s Heater Control Circuit High (Bank 1 Sensor 1).

I installed a new sensor and the (P0032) did not come back but a new code (P0131) O2 Sensor Circuit Low Voltage (Bank1 Sensor 1). I called the vendor and he sent me a new sensor that

does the same thing. I doubled checked the part number on the sensor which is identical to the factory one. (Volvo 9497252 Denso 3322).

The O2 volts on the factory sensor is a steady .5 volts on my Torque lite app but on the new sensors it spikes from ground to .8 volts. My engine runs bad with the new sensors revving in sync with the spikes from 750rpm to 1000rpm at idle.

Could they have changed the specs of the sensor which requires a Volvo to update the ECM?

Any ideas?

Original Sensor (P0032)

Original Sensor O2 volts


New Sensor (P0131)

New Sensor O2 volts

 

No - an ECM update is not the answer - more than likely the correct part is the answer.

A wide band oxygen sensor will produce the voltage reading as your original one did, a steady voltage. And that voltage reading is not indicative of what the sensor is doing. Earlier narrow band and your rear (narrow band) sensors produce a voltage like your example from the "new" front sensor. .2 volts is lean .8 volts is rich. That's the output I would expect to see from a narrow band sensor - a sine wave. What brand of sensor did you buy? Note the highlighted boxes below with the different signal characteristic of front and rear sensors. Also included info from Vida in regards to measuring O2 signals from a previous O2 discussion.

 

The Box says Bosch but the Sensor itself is inscribed with Volvo 9497252 Denso 3322. This is the exact same part number on the original O2 sensor.
I asked the vendor why it was a Denso sensor is in a Bosch box and he said Denso was the only Manufacturer for this sensor.
The first new sensor was a Denso 3501 76Y32. The vendor checked his stock and sent me another Denso with the exact part number as the original.
I did not take a picture of the New O2 sensor but it has the same (Volvo 9497252 Denso 3322) number inscribed on the sensor as the original.




Original Sensor

 

Thank you hoonk,

I purchased one from the Volvo Dealership (about $327 US) and it works nicely.
The original sensor was not responding like this new one. The rear sensor reacts differently now.
All codes are gone and my S60 is running better and gets much better mpg.