In need of a little help please...

[MAVPR]

Hello,
I Installed a Roe Supercharger and a set of Belanger headers over the winter. I have not driven the car yet as the roads are still full of salt. However i have it running (sounds awesome!!) but after idling for a min or 2 I get the fault code "P0140".
I believe this indicates a problem with an O2 sensor?
Do you think the problem is caused by the headers?
Any ideas on how to solve this problem?
Spring is approaching here in Scotland so any help or advice would be much appreciated!

Car is 1997 GTS

 

[Sam Goldfarb]

Did you omit the cats? Did you omit the O2 sensors? PO140 is no activity on O2 sensor Bank 1 Rear

 

[MAVPR]

Thank Sam,

Running R/T high flow cats, they were on the car before the recent install. Plugged the O2 sensors back into the new headers, haven't omitted anything on purpose, but maybe I should be taking another look at the O2 sensors to make sure the connections are good.

 

[MAVPR]

Sorry Sam I just reread that, you are saying the fault is with one of the rear O2 sensors. I had parts of the exhaust off so will check in case that sensor somehow got disconnected. I hope it's as easy as that!

 

[Sam Goldfarb]

Bank one is the side with cylinder one and the fault is the rear O2 sensor behind the Cat. It could be a loose wire or a bad O2 sensor. Also check the wires inside the plug. Many times when people unplug connectors they pull on the wires and the terminals in the plastic plug can become dislodged. I spent many hours diagnosing a problem like that and it was the terminal being slightly out of place in the plastic plug.