So I have some 'issues' a periodic CEL on the dash.
Just pulled the codes from my 1997 R 2.5v6 manual and...
13 - oxygen sensor, No change in voltage/open circuit
89 - Oxygen sensor heater, Low voltage
98 - Oxygen sensor, Open circuit, wiring break
121 - Oxygen sensor 2, Lean exhaust, weak mixture
The bit I'm baffled by is how to specify between which sensor?
On head #1 [driver's side] there is a new catalyst and a lambda sensor that has done less than 1000miles in my old Saab V6 that I broke on the track

; I cut off the Saab harness plug and silver soldered on the Vauxhall plug [same engines btw]. On the other side, head #2, there is an older aftermarket catalyst and yet another aftermarket lambda sensor but the wires are crimped on with insulation tape wrapped around - I'm hoping this is where the problem lies, p1ss poor installation by a garage that shall remain nameless near Grimsby.
I do have the other known low mileage sensor from my Saab sat in my shed; all I'll need to do is swap/solder the harness up and take it from there; any of you guys wish to coment on my thoughts? Or do you have better knowledge/understanding of the codes I found stored.