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S40 / V40 '96-'04 General Forum for the Volvo S40 and V40 (Classic) Series from 1995-2004.

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v40 1999, P0135

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Old Aug 15th, 2019, 15:00   #1
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Default v40 1999, P0135

Hi all,

getting P0135 from my ODB reader (O2 Sensor Heater Circuit (Bank 1 Sensor 1)):
- heater resistance 6 ohm, which seems reasonable (-> no open circuit, no short)

Disconnected O2 sensor cable, to measure O2 heater supply voltage without the load from the sensor:
a) ignition ON, engine OFF -> 3.8 volts
b) ignition ON, engine RUNNING -> 9.9 volts

Seems like odd values?
expected around 0 volts in case (a), and around 12 volts in case (b)...
supply wiring issue? or something I have missed?
Assume the heater power supply loop is controlled by the ECU somehow?
O2 sensor fuse checked/ok.
Is there possibly also a relay somewhere in the O2 heater power feed line?

Additional info:
engine code: B4204T
O2 sensor is 4-wire (yellow-black-white-red), heater on white/red loop.

Last edited by dahlgren; Aug 15th, 2019 at 15:41. Reason: added O2 sensor wiring
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Old Aug 19th, 2019, 11:34   #2
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Default "odd values" - ok

The voltage "odd values" mentioned in previous post seems to be ok after all:
had a chance to compare with a s40/2000, and the measurement results were more or less identical...
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o2 sensors, p0135

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