P0116 on Audi
Engine Coolant Temperature Sensor 1 Circuit Range/Performance
P0116 on Audi vehicles indicates engine coolant temperature sensor 1 circuit range/performance. Au7o has documented this code across 1 Audi model — most commonly on A1. 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 Audi range from $250 to $700, 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 Audi by Model
Audi A1(1 issue)
- EA211 Water Pump / Thermostat Housing Coolant Leak2015-2018
Later A1s using the EA211 family (1.0 TFSI three-cylinder and revised 1.4 TFSI) have an integrated, belt-driven water pump with a plastic thermostat housing bolted to it (two thermostats — one for block, one for head). The plastic housing and seals become brittle and leak, and the assembly can also be attacked by oil from a leaking PCV. Coolant escapes through a weep hole or housing gasket, leading to low coolant and overheating risk.
Looking for P0116 on a different make?
View P0116 across all makes →Frequently Asked Questions
What does P0116 mean on Audi?▼
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 Audi specifically, this code is documented across 1 model.
What causes P0116 on Audi vehicles?▼
Common causes on Audi: 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 Audi?▼
Repair costs on Audi range from $250 to $700, depending on the specific model and root cause.
Which Audi models have P0116 documented?▼
Au7o has documented P0116 on 1 Audi model: A1.