Parts for your 2017 Audi Q5-Temperature sensors

2017 Audi Q5 Temperature Sensors — What They Do and How to Look After Them

Temperature sensors are absolutely fitted to the 2017 Audi Q5 and they’re central to how the vehicle manages engine, transmission and climate systems. This isn’t guesswork: Audi factory repair information (ErWin/ELSA), Audi parts catalogues (ETKA), Bosch MED17/EDC17 engine management documentation, and ZF 8HP transmission service literature all specify multiple temperature sensors on this model year Q5. That makes temperature sensors both relevant and essential to reliable running and accurate diagnostics.

Across the 2.0 TFSI petrol and the TDI variants, the Q5 uses several temperature sensors to keep everything in the sweet spot. The engine coolant temperature sensor governs warm-up fuelling, ignition timing and radiator fan strategy. Intake air temperature informs turbo boost and mixture correction. Ambient air temperature feeds the HVAC and outside temp display. Transmission fluid temperature is monitored within the ZF 8‑speed’s mechatronic for shift quality and protection. Diesel variants add exhaust gas and DPF temperature sensors to control regeneration and emissions. Many models also monitor oil temperature for thermal management under the bonnet.

These parts are not typical “service interval” items, but they do age with heat and vibration. Signs a sensor is on the way out include hard cold starts, rough idle, poor fuel economy, fans running flat-out, erratic temperature readings, air conditioning misbehaviour, or limp-home mode. Scanning for fault codes is the sensible first step, the factory systems list sensors like G62 (coolant), G42 (intake air, often within the MAF), G17 (ambient), and various exhaust temperature sensors on TDIs.

When replacement is required, correct specification matters. For coolant temperature sensors, expect a small coolant loss, only work on a cold engine and refill with Audi-approved G12++/G13 coolant, bleeding air properly. Check the condition of the O-ring and retaining clip and inspect the connector for green corrosion. For IAT/MAF, ensure there are no intake leaks and the electrical pins are clean. Ambient air sensors live near the front grille or bumper – stone damage and water ingress are common, so secure routing and proper splash protection help. Transmission fluid temperature sensing is integrated into the valve body, it’s not a routine service item and is addressed during professional transmission repairs. On TDI exhaust/DPF temperature sensors, heat-cycled threads can seize, use penetrating fluid, the correct socket, and observe torque specs on refit.

• Good practice during servicing:
  • Run a diagnostic scan and save freeze-frame data.
  • Inspect harnesses and connectors near the radiator support and turbocharger for heat or chafe damage.
  • Avoid pressure-washing connectors, moisture wicks into pins and causes intermittent faults.
  • After replacement, clear DTCs and perform any required adaptations.

Popular questions about 2017 Audi Q5 temperature sensors

How do you tell if the coolant temperature sensor is faulty on a 2017 Q5?
Typical clues are a cold engine that runs rich or stalls, radiator fans that run constantly, a temperature gauge that behaves oddly, or stored codes such as P0116–P0119. A quick live-data check will show if the reported coolant temperature is plausible compared with ambient and actual engine warmth.

Do temperature sensors need regular replacement on the Q5?
No scheduled interval applies. They’re replaced on condition—usually when fault codes, poor drivability, or incorrect readings appear. During routine servicing, a scan and a quick visual check of connectors and wiring is usually all that’s needed.

Is it safe to drive with a bad temperature sensor?
It’s not recommended. A failed coolant sensor can trigger rich fuelling, poor economy, overheating risk, or limp-home behaviour. Short distances may be possible, but continued driving can escalate repair costs. It’s best to diagnose and rectify promptly.