2.0 JTS O2 sensor voltage
I'm trying to decide if there is an issue.
To give background, I did a major overhaul on engine 9k miles ago due to gasket failure. Head was skimmed, decoked along with injector cleaning. Obviously I did the usual Goetze piston rings with deglaze, bottom end shells etc whilst doing so. I have since fitted new Bosch pre-cat O2 sensors. Engine runs 10W/60 which is still fairly clean.
When warm, O2 sensor voltage is 2.25 at idle. It drops to 1.45 at fast idle or on road at speed. Voltage is steady at steady throttle.
Fuel trims are 4.6 & 8.4 (both positive values).
Post cat O2 sensors feed back 0.7 volts (+/- 0.05) but this reduces to 0.3 volts at 3750 rpm in 5th which is also fairly steady if throttle and speed are steady.
On the face of it, it seems a bit rich but fuel trims and post cat sensor do not necessarily agree.