Parts for your 2020 Audi Q5-Temperature sensors

2020 Audi Q5 temperature sensors — what they do and how to look after them

Based on Audi factory repair information (ElsaPro/erWin for the 2020 Q5), Audi Self‑Study Programmes covering the EA888 2.0 TFSI engine and HVAC systems, and common diagnostic references such as Ross‑Tech’s VCDS documentation, the 2020 Audi Q5 is fitted with multiple temperature sensors. These include the engine coolant temperature sensor (G62), intake air temperature sensing (within the MAP/MAF path), ambient air temperature (G17), A/C evaporator temperature, transmission fluid temperature, and exhaust gas temperature sensors on applicable variants. So yes—temperature sensors are very much relevant to this model.

On this Q5, temperature sensors quietly keep the lot in tune. The engine coolant temperature sensor tells the ECU how warm the motor is, shaping cold‑start fuelling, ignition timing, boost, and when the radiator fans kick in. Intake air temperature helps the car adjust spark and boost to suit Aussie or Kiwi heat, preventing pinging and keeping power consistent. The ambient sensor feeds the climate control and the dash display, while the evaporator sensor stops the A/C icing up. Transmission fluid temperature guides shift strategy and protects the gearbox. On certain variants, exhaust gas temperature sensors safeguard the turbo and catalysts under hard driving.

There’s no scheduled replacement interval for these sensors, but they should be checked during routine servicing. A quick scan of live data for plausibility, plus a look over connectors and wiring for corrosion or chafing, goes a long way. When replacing the coolant temp sensor, use a new O‑ring and retaining clip, catch and top up with the correct Audi‑approved coolant, and bleed the system properly. Intake and ambient sensors are simple swaps—avoid overtightening into plastic housings. EGT and transmission temp sensors can require specific tooling and torque specs, if they’re seized or buried, it’s a job best left to a specialist.

• Typical signs it’s time: hard cold starts, erratic idle, fans running flat‑out, poor fuel economy, A/C cutting in and out, or the dash showing nonsense temperatures.
• Common fault codes owners may see: P0116–P0119 (ECT), P0110–P0113 (IAT), P0070–P0073 (ambient), and EGT‑related codes on applicable models.
• Use quality OEM‑spec parts, some replacements need basic settings or adaptations with a scan tool.

Look after the sensors and the Q5 will manage heat, performance, and comfort exactly as it should—whether it’s a frosty South Island morning or a steamy summer arvo in Brisbane.

Popular questions

Where is the engine coolant temperature sensor on a 2020 Audi Q5?
On the 2.0 TFSI EA888, the ECT sensor is typically clipped into the thermostat housing/coolant flange near the front of the engine. Under the bonnet, remove the engine cover and you’ll spot it with a retaining clip and an electrical connector. Always relieve pressure and let the engine cool before removal.

How often should temperature sensors be replaced?
There’s no fixed kilometre interval. They’re replaced when they fail tests, log a fault code, or show implausible readings. Having a technician compare live data to real‑world temperatures at each service is the smart, low‑cost way to catch issues early.

Can a bad temperature sensor make the cooling fans run constantly?
Yes. If the ECU can’t trust the coolant or ambient reading, it often runs the fans as a fail‑safe. A quick scan will usually pinpoint the culprit so you’re not guessing at parts.