O2 sensor P0140 error code

Reply Subscribe

Thread Tools

Search this Thread

Apr 5, 2018 | 10:48 AM

neffy82

Thread Starter

Scooby Newbie

Joined: Jan 2018

Posts: 12

Likes: 0

From: high peak

O2 sensor P0140 error code

Hi, anyone had any experience with P0140 error code on a 2008 impreza sti hatch. The car has been decatted and every 100 miles or so the Eml comes on with code p0140 o2 sensor. Is there a mod you need to do when running a decat etc or is it a fault with the sensor or wiring?

Thanks

Apr 5, 2018 | 11:02 AM

peter zippy reid

Scooby Regular

iTrader: (25)

Joined: Jan 2010

Posts: 3,685

Likes: 11

From: Hamilton scotland

Is the car mapped for the decat if not your asking for trouble

Apr 5, 2018 | 11:06 AM

Don Clark

Scooby Regular

Joined: Feb 2003

Posts: 7,816

Likes: 824

From: Harpenden

DTC P0140 O2 SENSOR CIRCUIT NO ACTIVITY DETECTED (BANK1 SENSOR2)

It's either dead, wiring harness fault, or has been removed in the decat process.

Apr 5, 2018 | 11:21 AM

neffy82

Thread Starter

Scooby Newbie

Joined: Jan 2018

Posts: 12

Likes: 0

From: high peak

Quote:

Originally Posted by peter zippy reid

Is the car mapped for the decat if not your asking for trouble

the car has been mapped with all the mods on it, so I presume the car was mapped with the decat.

Apr 5, 2018 | 11:24 AM

neffy82

Thread Starter

Scooby Newbie

Joined: Jan 2018

Posts: 12

Likes: 0

From: high peak

Quote:

Originally Posted by Don Clark

DTC P0140 O2 SENSOR CIRCUIT NO ACTIVITY DETECTED (BANK1 SENSOR2)

It's either dead, wiring harness fault, or has been removed in the decat process.

i did remove a loop out of the wiring harness a few months when sorting a different problem out, as I wasn’t sure why there would be a loop in the harness or the o2 sensor. Should I have kept the loop in?