02 Fault Code Question

[Bill@NYC]

Does anyone know the difference between fault code P0133 and P1275 (for a 2001 Boxster S)? They both seem to be for the 02 sensor reading ahead of the CAT. I was getting both but the shop seems to have gotten the P0133 to stop throwing, but I'm still getting the P1275. I can't figure out what the difference is.

I have a 2001 Boxster S with a 3.4 L engine, fabspeed exhausts, EVO intake and REVO software if anyone has any ideas.

Thank you.

[Loren]

:welcome:

For your future reference the OBD II fault codes (for your car) can be found here.

P0133 Signal Period for Oxygen Sensor Aging, Bank 1 – Above/Below Limit

Potential causes:

– Oxygen sensor ahead of TWC

– Wiring (oxygen sensors exchanged)

P1275 Signal Delay Time for Oxygen Sensor Aging, Bank 1 – Above/Below Limit

– Oxygen sensor ahead of TWC

– Leak ahead of TWC or in the area of the oxygen sensor after TWC

– Wiring (oxygen sensors exchanged)

Looks like the O2 sensor on bank 1 ahead of the TWC is not responding within limits. If you have more than 60,000 miles chances are it is worn out.

[PTEC]

Agreed. Pretty much any time you get a fault for o2 sensor ageing, the sensor is toast.