P0154 -O2 sensor before ahead of cat. conv. Cylinder (4-6)

[Boxster33]

Hi All, I have a 2000 Boxster S with 43,000 kms. Went for a drive the other day when the check engine light came on. Durametric software shows fault code:

Current Fault Codes

P0154:
Porsche fault code 18 - O2 sensor ahead of cat. conv. Cylinder (4-6)


Is this code indicating that the 02 sensor before the CAT should be replaced on the drivers side? The one closet to the muffler?

Is this the correct part?

2000 Porsche Boxster S Convertible - Exhaust Pipes, Manifolds & EGR - Page 1

Thanks in advance.

[JFP in PA]

Originally Posted by Boxster33

Hi All, I have a 2000 Boxster S with 43,000 kms. Went for a drive the other day when the check engine light came on. Durametric software shows fault code:

Current Fault Codes

P0154:
Porsche fault code 18 - O2 sensor ahead of cat. conv. Cylinder (4-6)


Is this code indicating that the 02 sensor before the CAT should be replaced on the drivers side? The one closet to the muffler?

Is this the correct part?

2000 Porsche Boxster S Convertible - Exhaust Pipes, Manifolds & EGR - Page 1

Thanks in advance.

P0154 indicates a signal loss from the sensor. While it could be the sensor, more often it is a connector or wiring issue causing the interruption.

[100deltacharlie]

I have a 2001 S. Same diagnosis from my mech...suggested both front sensors for $600.
At the same time my boat was giving me some trouble..traced to fuel issue. On a hunch I switched to only Mobil premium gas. Two tanks later the check light is out...
Cheaper than $600!!