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Discussion Starter · #1 ·
These don't seem to be popular codes, anyone have experience with this O2 sensor code? I've cleared several times with my scanner but keeps coming back. GM ext. warranty likely doesn't cover the O2 sensors since an emission related item so I wanted to know my options?

here's an online blurb:
OXYGEN SENSOR TROUBLE CODES
>
>
> There are two types of Oxygen Sensor trouble codes: O2 heater circuit codes
> and O2 sensor codes.
>
>
> O2 Heater circuit related codes include P0036, P0037, P0038, P0042, P0043,
> P0044, P0050, P0051, P0052, P0056, P0057, P0058, P0062, P0063, P0064 &
> P0141.
>
>
> O2 Sensor related codes include P0130, P0131. P0132. P0133, P0134, P0135,
> P0136, P0137, P0138, P0139, P0140, P0142, P0143, P0144, P0145, P0146,
> P0147, P0150, P0151, P0152, P0153, P0154, P0155, P0156, P0157, P0158,
> P0159, P0160, P0161, P0162, P0163, P0164, P0165, P0166 & P0167
>
>
> The heater codes will set if a fault is detected in the O2 sensor heater
> circuit. The O2 sensor codes will be set if the O2 sensor readings remain
> low (lean), or high (rich), or do not change quickly enough, or do not
> change at all.
>
>
> The O2 sensor reads unburned oxygen in the exhaust, and generates a voltage
> signal that is proportional to the amount of oxygen in the exhaust. The
> signal can vary from a low of about 0.1 volts up to a high of about 0.9
> volts. A low voltage signal indicates a lean fuel mixture. A high voltage
> signal indicates a rich fuel mixture. The engine computer uses the O2
> sensor's input to balance the fuel mixture during closed loop operation. A
> bad sensor may prevent the system from going into closed loop, and usually
> causes the fuel mixture to run rich causing an increase in fuel consumption
> and emissions.
>
>
> A low voltage (lean) reading may indicate a bad O2 sensor, a vacuum leak,
> or a condition that allows unburned oxygen to enter the exhaust. Check
> intake vacuum at idle, and inspect vacuum hose connections. If okay, check
> for a misfiring cylinder, a burned exhaust valve that is leaking
> compression, or a leaky exhaust manifold gasket.
>
>
> O2 sensor quick checks include watching the sensor's output voltage as the
> fuel mixture changes. Momentarily disconnecting a vacuum hose will cause a
> lean response from the O2 sensor. No change in the reading or a very
> sluggish response would indicate a bad O2 sensor.
>
>
> NOTE: If you get an oxygen sensor code plus a random misfire code and a MAP
> sensor code, the engine probably has a serious vacuum leak.
>
 

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Discussion Starter · #2 ·
replying to own post

turns out its the 2nd O2 sensor.
$133 new unit for 2003. 2004 + the part is $275+ for some reason..
 

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Same issue here:

"P0036: HO2S Heater Control Circuit (Bank 1 Sensor 2)"

Used a crappy chinese bth adaptor.

Cleared the CEL for now but sometimes i get the error in "pending" state.

How did you found the faulty O2?
 
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