The coolant temp signal drops in and out — often a corroded pin on Ford or Vauxhall petrols.
P0119 — also written PO119, P 0119, 0119 — is the OBD-II code for ect sensor circuit intermittent. Same code, same fix: this page covers every spelling of it.
P0119 means your engine's brain is losing its connection to the coolant sensor, usually due to a dodgy plug on common UK Fords and Vauxhalls.
P0119 is a sensors fault code, typically costing £40–£180 to put right in a UK garage.
What P0119 actually feels like to drive
- Temperature gauge needle dropping to zero and then bouncing back up while driving.
- Radiator fans screaming at full speed even when the engine is stone cold.
- Car 'kangaroos' or hesitates when accelerating because the ECU thinks it's freezing cold for a split second.
- Stop/Start system stops working and displays a 'Service Engine Soon' message.
- Poor fuel economy because the ECU stays in 'warm-up mode' unnecessarily.
What causes P0119?
- Corroded pin in ECT plug
- Failing sensor
- Loose connector
UK vehicles that throw P0119 most often
- Vauxhall Astra J 1.4 Turbo (A14NET) 2010-2015
- Ford Focus Mk3 1.0 EcoBoost 2012-2018
- Vauxhall Insignia A 2.0 CDTi (A20DTH) 2008-2017
- Ford Fiesta Mk7 1.25 Zetec 2008-2017
- Mini Cooper (R56) 1.6 N12/N14 engines 2006-2013
How P0119 is fixed
- Replace sensor and connector body
- Clean pins
The P0119 misdiagnosis that wastes money
I’ve seen dozens of lads jump straight to a thermostat or even a water pump because the gauge is bouncing around like a yo-yo. They waste a hundred quid on a new housing and a coolant flush only for the light to pop back on two days later. Nine times out of ten on the Vauxhall A14NET engines, it’s not the mechanical side at all—it’s the actual plastic connector plug vibrating itself to death or the pins turning green with corrosion. Stop guessing and check the live data for 'flat-line' drops to -40°C.
What a UK garage should charge for P0119
A basic diagnostic plug-in at an indie will run you £40 to £60. A genuine Bosch or Delphi sensor is usually cheap, around £15–£30, but the labour to bleed the system afterwards adds up. If you need the connector plug replaced (the pigtail), expect to pay about £120 to £180 total for parts, labour, and fresh OAT coolant. A main dealer will easily double that, charging you £150 just to look at the car.
P0119 repair cost in the UK
Most P0119 repairs land between £40–£180 including parts and labour. The spread is wide because the cheap fix (a sensor, a hose, a leak) and the expensive fix (a major component) throw the same code — which is why a proper diagnosis before parts are bought saves the most money.
Bob's tip on P0119
Before you let a garage sell you a 'full cooling system overhaul,' ask them to perform a 'wiggle test' on the ECT sensor loom while monitoring live data on their scan tool. If that temperature reading jumps from 90 to -40 when they touch the wire, you’ve found your culprit. Insist on a 'pigtail' repair kit (a new plug with a bit of loom) rather than just a new sensor. If you only swap the sensor, the loose terminals in the old plug will just ruin the new one within a month.
Can you drive with P0119?
Yes.
Urgency: medium.