CEL 2001 Boxster S - Advice please

[bobbiepepper]

I'd appreciate some advice.

I have a 2001 Boxster S with 165 000KM.
It drives great, but has been throwing O2 codes for a couple of years.
It has been throwing codes:

P0140 - Factory Fault code 12
P0139 - FFC 17
P1119 - FFC 5
P0430 - FFC 45

It has also thrown

P0133 - FFC 15
P1275 - FFC 16
P1117 - FFC 14
P1130 - FFC 361
P0420 - FFC 40

My investigations lead me to believe it the Driver side Front and Passenger side rear (before and after the Cats are the problem)

To do some real slothing I decided to swap all the sensors to the opposite sides.
In my mind if the codes showed the opposite sides then it really is the sensors.

Now I get:

P0420 - FFC 40
P1115 - FFC 13
P0430 - FCC 45
P1130 - FFC 361

The P1115 reads the Passenger side now, but the other codes are about the same.

Do you guys think this is enough confirmation to put in a couple of new sensors?

Or with this many codes am I just looking at a MAF or Vacuum leak?

I'd appreciate any advice.

Thanks

[bobbiepepper]

It didn't throw all those codes at once.
Usually 2-4 at a time over the last 2-3 yrs.
If I clear the codes I'm good for 25 - 100 KM before they come back.

[Wayne 962]

Wow, swapping all of the sensors seems like a lot of work. It could be a problem with an old sensor, coupled with another problem, which would make this difficult to diagnose using that method. Normal replacement intervals show that the O2 sensors and the MAF sensor are due to be replaced (if they haven't been already). I would probably replace those and then diagnose from there. At least then, your starting with a clean slate, and odds are the replacement of the sensors will fix the problem.

-Wayne

[bobbiepepper]

The hardest part was getting the car jacked -up securely.
Once that was done the sensors were a breeze (with the help of a breaker bar).


Thanks for the advice.

P.S. your tech articles are great!!!

[hms1]

Is this 02 sensor pre or post CAT?

[mikefocke]

Bank 1 pre-cat.