For several weeks, I had an issue with the oxygen sensor, which I kept clearing (P2275-00 Oxygen sensor signal stuck rich. Bank 1 - sensor 3). The sensor was replaced once in 2022 by JLR during a recall. Yesterday, after replacing it once again, the error disappeared. However, even though the vehicle starts in electric mode each time, when the combustion engine kicks in (sudden acceleration, etc.), it won't switch back to electric mode, unless ignition is turned off and back on. I initially thought this was related to the O2 sensor, but the problem persists. Has anyone with a P400e experienced something similar?

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OK, so one day later it started working normally (as it did before the O2 sensor broke), maybe it’s because yesterday it was hotter (40°) and today it’s only 35° and the petrol engine was required for cooling?! Anyway, the switch between thermal and electric is happening now like in the good old days...

The petrol engine shouldn’t be required for cooling unless it has a fault. Should work fine in ev mode. My Previous RR's!
2018 P400e Autobiography
2008 TDV8 Vogue
2006 TD6 Vogue
2007 TDV8 Vogue
2007 RRS (I know, it doesn't count!)
2005 4.4 Vogue on LPG
2005 TD6 Vogue
2003 4.4 Vogue
2001 4.6 HSE
2000 2.5 DHSE
1999 4.6 HSE
1997 4.6 HSE on LPG
1995 2.5 DSE
1989 3.9 EFI classic
1988 3.5 EFI classic

Yes, now it does. I thought it would perform similar to very cold temperatures, when the ICE kicks in...

Mine does the same every time jlr connect the diagnostic equipment , goes back too normal after 40-50 miles
Have you had anything connected to the obd port ? Last night I lay in bed looking up at the stars in the sky and I thought to myself, where,s the f**king ceiling!!

Yes, to delete the errors, the Autel MaxiAP200.

OK, after two days of normally switching between electric and ICE, it started behaving like before, that is starting electric, but after switching to engine, it doesn't switch back to electricity unless the on off button is pressed. No errors this time, I am lost... Checked both 12V batteries, OK. Again, could it be the outside temperature, it's over 35deg?

To conclude this thread, it was the O2 sensor, after this summer's crazy temperatures ceased, the car started functioning normally and still does (knock on wood).