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Old 11-01-2005, 02:26 PM   #1
MY99 2.5GT
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Member#: 5030
Join Date: Mar 2001
Chapter/Region: MAIC
Location: Martinsburg, WV, USA
Vehicle:
1999 Legacy 2.5GT
05 Legacy GT 06 Armada

Default CEL-02 Heater Circuit (Happens even after sensor replacement)

My 95 Impreza 2.2 which happens to be OBD-II has been throwing a pair of the exact same CELs. PO135 O2 Heater Circuit Malfunction (Bank 1 Sensor 1).

I replaced the front O2 sensor and receive the same 2 codes. I have both cleared the code with a scanner and reset the ECU by disconnecting the battery.

Wiring is what comes to mind first but I checked to make sure things were secure where the sensor plugs into the harness in the engine bay. I have seen before where pins have backed out of those connectors. I made sure that wasn't the case with this one.

Any help would be great.

Thanks
Brad
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Old 11-01-2005, 03:40 PM   #2
armand1
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Location: Seattle, WA
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'02 OBS 2-tone!
'95 Montego Miata

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I'm pretty sure the "test" for an O2 heater circuit is looking for the correct resistance value between the two O2 heater wires. Perhaps one of those wires has broken or a connection has corroded.
Unplug the connector in the engine bay, use a multimeter on the two pins (sensor side) leading to the heater, and measure the resistance. If none, you've got a short; if very high, you've got a broken wire or bad connection.
Also, be sure you're dealing with the correct O2 sensor.
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Old 11-01-2005, 05:23 PM   #3
JimBlake
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Also, NEITHER SIDE of the heater should have any continuity to ground.
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Old 11-01-2005, 08:56 PM   #4
MY99 2.5GT
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Member#: 5030
Join Date: Mar 2001
Chapter/Region: MAIC
Location: Martinsburg, WV, USA
Vehicle:
1999 Legacy 2.5GT
05 Legacy GT 06 Armada

Default

PO135 is the code for front 02. The car is running fairly smooth but is getting a little worse mileage then before the CEL. I will troubleshoot the wiring on my brand newly installed sensor this weekend.

Brad
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