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02 Sensor Codes


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Hi All,

New to this forum, so if this has been posted before sorry!

I am going to replace these sensors myself and wanted to find out where exactly where they are before I get into the process. Any DIY tips or tricks are much appreciated.

1997 986 with 47K miles.

Here are the codes for your info:

P0140 Oxygen Sensor After Catalytic Converter (cylinders 1 - 3) - Interruption of Signal

P1117 Oxygen Sensor Heating 1 After Catalytic Converter - Below Lower Limit

P1275 Aging of Oxygen Sensor Ahead of Catalytic Converter (Cylinders 1 - 3) - Below Lower Limit

P0139 Aging of Oxygen Sensor After Catalytic Converter (Cylinders 1 - 3)

Thanks for any help with this!

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P140 possible causes:

Open circuit in signal wire or ground wire of one oxygen sensor.

Oxygen sensor heating not functioning.

DME control module output stage faulty.

Potential fixes:

- Wiring harness

- Oxygen sensor

- DME control module

P139 possible causes:

Oxygen sensor value does not change towards rich or lean.

Potential fixes:

- Oxygen sensor

P1117 possible causes:

Heating current too low.

Potential fixes:

- Contact resistance.

- Heating resistance too high.

- Open circuit in heating current circuits.

- Open circuit in H02S signal wire.

- Short to B+ (output stage cut off).

- Heating resistance too high.

- Open circuit in heating current circuits.

- Open circuit in H02S signal wire.

- Short to B+ (output stage cut off).

P1275 possible causes:

Emission values are exceeded by 1.5 x.

Potenial fixes:

- Oxygen sensor

Looks like a bad O2 sensor to me...

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Thanks for the very informatiave post Loren! I appreciate it!

I am looking for which side of the engine the fouled sensors are on, I think it is the drivers side. Correct? Is there a diagram of the engine to show where the 1-3 cylinders are?

Thanks again!

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Thanks for the very informatiave post Loren! I appreciate it!

I am looking for which side of the engine the fouled sensors are on, I think it is the drivers side. Correct? Is there a diagram of the engine to show where the 1-3 cylinders are?

Thanks again!

http://www.renntech.org/forums/index.php?s...indpost&p=29574

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