Hot engine temperature warning - P0118

Questions specifically about a Diesel powered C3 (usually engine or fuel related problems)
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Diesel engine related problems
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My Name: Pjn4156

Member
Posts: 1
Joined: Tue Nov 16, 2021 5:40 pm
Model: C3 Picasso
Year: 2009 (59)
Engine Size: 1.6
Fuel Type: Diesel
Mileage: 85000
Trim Level: Exclusive
Gearbox: Manual 5 speed
DPF: Yes
LHD or RHD: RHD (UK)
Engine name: DV4 16-valve diesel (90 PS)

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Hi all I have a c3 Picasso 1.6hdi that currently is causing me headaches . Having issue of bad starting when cold and also engine temperature to high alarm comes up almost straight away . Then after a short time the anti pollution alarm flashes up . Diagnostics code of p0118 of which is not clearing . I've changed the ECT senor and still had the fault . Now had a vehicle electrician check all wiring and he said can't find any issues there . So my question is are there anymore engine temp switches I could change or is it worth changing the actual thermostat housing . Could it be the ECU it's self . Sorry I know its a lot of things but really need help . Not sure what other info I need to give Many thanks in advance .
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My Name: C3CAR

Guru
Posts: 2634
Joined: Wed May 04, 2011 10:01 am
Model: C3 2002-2005, Original shape model
Year: 2002 (02)
Engine Size: 1.4 (16v)
Fuel Type: Diesel
Mileage: 140000
Trim Level: Exclusive
Gearbox: Manual 5 speed
DPF: No
LHD or RHD: RHD (UK)
Engine name: DV4 16-valve diesel (90 PS)
Has thanked: 154 times
Been thanked: 90 times

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Pjn4156 wrote: ↑Tue Nov 16, 2021 6:06 pm Hi all I have a c3 Picasso 1.6hdi that currently is causing me headaches . Having issue of bad starting when cold and also engine temperature to high alarm comes up almost straight away . Then after a short time the anti pollution alarm flashes up . Diagnostics code of p0118 of which is not clearing . I've changed the ECT senor and still had the fault . Now had a vehicle electrician check all wiring and he said can't find any issues there . So my question is are there anymore engine temp switches I could change or is it worth changing the actual thermostat housing . Could it be the ECU it's self . Sorry I know its a lot of things but really need help . Not sure what other info I need to give Many thanks in advance .

Hello Pjn4156

I would connect up lexia tool (available here) to monitor the live data from the Engine Coolant Temperature sensor.

The P0118 fault could be a bad earth, poor connection at the sensor or a failed ECT bad sensor. You have changed the sensor and had the wiring checked so that leaves the live data to look for constant or intermittent faults on the sensor which may help identify the cause.
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