My 4.4 is in restricted performance and showing the code P050E-00 cold start engine exhaust temperature too low. Has anyone else managed to fix this problem?

That to me would point to a failed temperature sensor on the left hand exhaust manifold. It's quite common for these to fail, which is what would increase my confidence in thinking it is that. 2015 Range Rover Autobiography 4.4 SDV8

I've tried viewing the live data using icarsoft and the temperature for all the sensors is showing 100 degrees even when the car is cold which is throwing me off as to which one it could be

00 should indicate left bank.

Also, they can read 100 degrees when faulty however, I think it's unlikely both sides have gone.

Tried a battery disconnect (both poles), leave for 10 minutes then reconnect? 2015 Range Rover Autobiography 4.4 SDV8

I'll try disconnecting the battery tomorrow thanks mate. I did change the oil cooler as it had a bad oil leak and disconnected the temp sensor without disconnecting the battery so wondering if that's what has caused it as I never had the problem before that.

100 degrees is the low value coded into the ECM, you need to get the exhaust warm to evaluate if they're reading correctly.
A faulty sensor can cause a reading of 100 degrees if the resistance is below the measuring range of the ECM, an open or shorted sensor will set an appropriate DTC.

To confirm the DTC you need to accurately measure the resistance across the sensor and compare (in the absence of test values) with the non-faulting sensor. Make sure to measure at 'cold' and after the engine has been run at a fast idle for a few minutes.

If the values are broadly similar, then you need to confirm there is no resistance in the wiring to the ECM and the pin grip is OK. Obviously, if there is a disparity in the readings, then it's 'just' the sensor giving incorrect resistance values.

Unless you disconnected the sensor with the ignition on, then that shouldn't make any difference, in any case, once correct values are 'seen' then the DTC will be stored and not current. It may be worth checking both sides of the connector for fluid ingress.

I had the similar p0040d code, for near side exhaust sensor. I was confident it was not allowing a DPF regen,. I measured the sensors internal resistance, it was open circuit. Ordered a new one, and then found I couldn’t get the old retaining nut off, after destroying old sensor. Plugged new sensor, loosely to loom, and cleared the code… presto. But the sensor although tests ok at cold, wouldn’t ever ‘get hot', and hence still no DPF regen. So I removed it from loom, took indoors, heated up sensor, measured it’s resistance. When red hot on gas stove, it went no lower than 650 ohms. Therefore, if I connected a resistor on old broken sensor wiring plug, of 650 ohms, the car would see an acceptable reading (650 ohms) and throw no code, but would actually see a ‘hot sensor’, and coupled with the other needed factors, to allow a DPF regeneration, (other temp sensor, and fuel tank over 1/4 and speed over 30mph, it could trigger a regen. Problem solved. Car ok, DPF regens occurring when needed, new resistor from eBay about a £1. For ten! New sensor not needed!

Last edited by johnboyairey on 23rd Aug 2022 6:29am. Edited 1 time in total

You guys are very clever. If I can't fix it with a spanner I'm
I think we need a separate section on the forum to explain what all the abbreviations mean!!