P0116 on Peugeot: How to Diagnose & Fix
Engine Coolant Temperature Sensor 1 Circuit Range/Performance
1 Peugeot model · 1 documented issue · 1 critical · $600-$1,200 repair
P0116 on Peugeot by model: symptoms, diagnosis and fix
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)
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 on a Peugeot?
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. On Peugeot it is documented across 1 model: 206.
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 on a Peugeot?
Published repair estimates on Peugeot range from $600 to $1,200 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
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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.