P0116 on Jaguar
Engine Coolant Temperature Sensor 1 Circuit Range/Performance
P0116 on Jaguar vehicles indicates engine coolant temperature sensor 1 circuit range/performance. Au7o has documented this code across 1 Jaguar model — most commonly on XJ. 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. Typical repair costs on Jaguar range from $600 to $1,800, depending on the specific model and root cause.
Common Causes of P0116
- •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)
P0116 on Jaguar by Model
Jaguar XJ(1 issue)
- Plastic Thermostat Housing and Water Pump Impeller Failure on the 4.2 AJ34 V82004-2009
The naturally aspirated and supercharged 4.2-litre AJ34 V8 in the X350/X358 carries an unusually large amount of load-bearing plastic in the cooling system. The thermostat housing is plastic and its internal support fractures, which lets coolant recirculate through the engine while bypassing the radiator — the car overheats even though the coolant level and the pump are fine, which sends people chasing head gaskets. Separately, the water pump uses a composite impeller that erodes and shreds, and the plastic retaining ring holding the pump's O-ring crumbles at the bottom of the pump. Additional chronic weep points are the overflow nipple on the coolant expansion tank and the two heater hoses that run beneath the intake manifold. This is a distinct problem from the X351's water pump failures — different engine family, different parts.
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View P0116 across all makes →Frequently Asked Questions
What does P0116 mean on Jaguar?▼
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 Jaguar specifically, this code is documented across 1 model.
What causes P0116 on Jaguar vehicles?▼
Common causes on Jaguar: 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. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0116 on a Jaguar?▼
Repair costs on Jaguar range from $600 to $1,800, depending on the specific model and root cause.
Which Jaguar models have P0116 documented?▼
Au7o has documented P0116 on 1 Jaguar model: XJ.