P0116: How to Diagnose & Fix — Engine Coolant Temperature Sensor 1 Circuit Range/Performance
14 vehicles · 9 makes · $30-$2,000 repair
How to diagnose and fix P0116: most-reported vehicles
Ranked by owner reports. Each card gives the symptoms, how to confirm the cause, the fix, parts and sources for that vehicle.
Peugeot 206 · 2000–2012
The TU-series engines in the 206 are prone to head gasket failure, particularly when the cooling system is neglected. Overheating episodes accelerate gasket deterioration, leading to coolant-oil mixing and white exhaust smoke.
Common Symptoms
- White exhaust smoke
- Coolant loss without visible leak
- Oil-coolant emulsion on dipstick
- Overheating
How to Fix
Replace the head gasket, machine the cylinder head surface if warped, and flush the cooling system. Inspect and replace the thermostat and water pump preventatively.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- TU3JP 1.4 8V head-gasket set and head-bolt package
Confirm VIN, engine code, gasket thickness/application and current bolt procedure.
- TBK4983WP TU3 timing-belt and water-pump kit
Confirm VIN and engine/DAM configuration.
- TU5JP4 NFU 1.6 16V head-gasket set and head bolts
Confirm VIN, production/engine number and required gasket specification.
- Gates KP15581XS or KP25581XS TU5JP4 belt and water-pump kit
Peugeot 206 1.6 NFU TU5JP4; KP15581XS to engine 1806404 and KP25581XS from engine 1806405. Confirm VIN/engine number before choosing.
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Sources for this issue (1)
Renault Clio · 2012–2026
The TCe turbocharged engines develop coolant leaks from the turbocharger coolant lines and the thermostat housing. The plastic coolant connectors become brittle with age and heat exposure, causing seepage and eventual failure.
Common Symptoms
- Coolant loss
- Sweet smell from engine bay
- Low coolant warning
- Overheating risk
How to Fix
Replace the turbo coolant lines with updated metal fittings where available. Replace the thermostat housing assembly. Pressure test the cooling system after repair to verify no further leaks.
Sources for this issue (2)
Citroen DS3 · 2010–2019
The DS3 water pump, which is driven mechanically from the crankshaft pulley on the EP6 (Prince) engines, fails prematurely, causing coolant circulation loss and engine overheating. The pump impeller can also degrade, reducing flow rate without complete failure. This is a common EP6/THP engine issue.
Common Symptoms
- Engine overheating
- Low coolant warning
- No cabin heat
- Coolant temperature fluctuation
How to Fix
Replace the water pump together with its drive belt or friction wheel. Check the thermostat operation and coolant condition. Flush the cooling system and refill with the correct antifreeze specification.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Genuine PSA 1201J8 electric auxiliary coolant pump
replace a command-tested failed electric auxiliary coolant circulation pump on an applicable THP configuration Fitment/availability: Citroen DS3 auxiliary electric coolant-pump branch only when VIN/OE matches 1201 H9, 1201 J8, 1201 N1 or…
As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.
Sources for this issue (2)
Audi A4 · 1996–2001
Volkswagen Golf R · 2015–2021
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P0116 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P0116 mean?
P0116 stands for "Engine Coolant Temperature Sensor 1 Circuit Range/Performance." P0116 means the engine control module detected an engine coolant temperature (ECT) sensor reading that is within wiring limits but doesn't make sense — for example, it doesn't rise as the engine warms up, or it disagrees with other temperature data. The ECT sensor reports coolant temperature, which the computer uses for fuel mixture, ignition timing, cooling-fan control, and emissions monitors. An implausible reading can cause poor fuel economy, hard cold starts, or failed emissions readiness. It is generally drivable but should be fixed for proper engine management.
What are the most common causes of P0116?
The most common causes of P0116 are: Faulty or drifting engine coolant temperature sensor, Stuck-open thermostat (engine never reaches normal temp), Low coolant level or air in the cooling system, Wiring or connector resistance affecting the signal, Sensor reading inconsistent with intake-air temperature at cold start, Corroded sensor connector, PCM fault (less common). The specific cause varies by vehicle.
How much does it cost to fix P0116?
Repair costs for P0116 range from $30 to $2,000, depending on the vehicle and root cause.
Which vehicles are affected by P0116?
Au7o has documented P0116 across 14 vehicle models from 9 manufacturers: Audi, Chevrolet, Citroen, MINI, Peugeot, Renault, SEAT, Toyota, Volkswagen.
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Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.