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Interpreting fault codes on 98 986 DME 5.2.2

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I purchased this weekend a Actron CP9175 Auto Scanner and of course I plugged it in right away after reading the instructions. All went well but the results came back as follows:

P0130 PENDING 02 Sensor Cir Malf Bank 1

P0150 PENDING 02 Sensor Cir Malf Bank 2

The igniton was in the ON position engine NOT running.

Are these codes being returned since the engine was not running or do the 2 02 sensors need to be looked at or replaced? Should I rerun the diagnostics with the engine running?

Last week when I was under the vehicle I could only visually spot 2 post catalytic converters. They look to be easily replaced.

Any help with this new tool would be greatly appreciated.

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P0130 Oxygen Sensor Ahead of Catalytic Converter (Cylinders 1 - 3) - Intercore Short Circuit or Limited Voltage Increase

Possible causes

- Oxygen sensor

- Wiring harness

- DME control module

P0150 Oxygen Sensor Ahead of Catalytic Converter (Cylinders 4 - 6) - Intercore Short Circuit or Limited Voltage Increase

Possible causes

- Oxygen sensor

- Wiring harness

- DME control module

Fault codes are stored so whether the engine is running or not does not matter.

I would erase these codes and see if they come back. Highly unusual to have a bad O2 sensor on both sides of the engine at the same time.

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L, thank you for the advice. I will clear those 2 tonight and take the car for a spin and recheck.

I can only visually spot the 2 O2 sensors post cat conveters. Does this make model only have the 2? One on each side.

I looked pre cat converter and could not see any.

Car runs fine and NO CEL lights on at any time.

P.S. with yours and the help of the other responders I 'cracked' open the engine compartment and for the 1st time got a peek into the engine bay and heard the engine running witout all the covers and insulation. Very nice indeed. Since being in our family since 98 I can guarantee I have been the 1st 'caretaker' to have even attempted this task. Thanks again for the step by step advice it was easy and quite the adventure, like opening a present on the holidays.


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Richard, the car was delivered to Calif. So it was manuf for the US. I was changing the oil last week and easily spotted the 2 aft of the catcl converters. I did not 'spy' deeper pre catyl converter as I was running out of daylight here in the eastern US. I'll crawl back under and peek around to see if there are 2 more 'pre' catly converter.

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