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My 2002 Forester Check Engine light is on. I connected an Autel MaxiScan MS300 OBD-II scan tool and got indication for two codes. Browsing through the codes, it reads P0130 and P0130 P.

The first one is easily found to be the O2 sensor problem:

O2 Sensor Circuit Malfunction (Bank 1 Sensor 1)

However, I could not determine what the second code means. Obviously it is closely related to the P0130 code, but the tool specifically indicates two codes rather than one.

So, any idea what this P suffix can indicate? The tool user manual is not helpful here.

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1 Answer 1

up vote 5 down vote accepted

Pending code? The user manual for your device says it should say "PD" for pending codes, so maybe not. "P0130 P" isn't a valid DTC for your vehicle so pending code is really all that makes sense.

More specific to your model P0130 is front oxygen sensor circuit range/performance problem (Lean)

Possible causes:

  • Open wire to O2 Sensor
  • Short to ground in O2 sensor wire
  • Exhaust Leak
  • Faulty Sensor
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Mmm... why would it be pending, when the actual code is displayed first??! –  ysap Jan 8 at 23:07
3  
@ysap The code without the P at the end is a history code, meaning that that code has happened in an earlier drive cycle. The pending code means it's a current code. –  Larry Jan 9 at 0:04

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