Guys, want a second opinion on an issue I am having with an o2 sensor on my X20XEV 1998 Estate.
Last week or so I have randomly had the EML come on soon after starting a drive (about a minute I believe). Car still runs fine, no problems. Turn the car off and back on, even straight away, light goes out and stays out. This can happen cold or hot as well.
Have run Tech 2 on it and the code is P0130. Live data shows the sensor working normally through its range from 11mV upwards. Hard throttle goes open loop, sports mode goes open loop on overrun and high rpm/load. Closed loop at all other times once coolant temp is above threshold.
When the EML is on, the reading is open loop and either 39mV or 11mV (cannot remember which) and is static. This obviously would give the P0130 code as o2 performance is out of spec.
I cannot remember changing the lambda sensor since I got the car in 2012 and it has done probably 50k since. Cat is new last year but as is before sensor should make no difference. No visible or audible leaks from manifold or other but, again, this would give probably a different code if there was a leak.
My question is... is this an internal defect in the Titania lambda sensor (but is weird in the randomness) or wiring (nothing obvious I can see but have not had a chance to disconnect plug, etc..)?
Any thoughts? I am going to look through my collection and see if I have an old sensor from either my X20XEV Cavalier I had or from an older 1994 X20XEV Omega I helped break up a few years ago and may have kept to swap but want to clarify fault before I go spending the best part of £60 on a new TDK lambda sensor.