Parts for your 2011 Audi Q5-Temperature sensors

2011 Audi Q5 temperature sensors — what they do and how to look after them

Temperature sensors absolutely are fitted to the 2011 Audi Q5 and they’re central to how the car runs. Audi’s factory service information (Elsa/erWin) lists the Engine Coolant Temperature (G62), Intake Air Temperature (often integrated with the MAF on petrol TFSI), Ambient Air Temperature (G17), transmission oil temperature sensing, and—on TDI models—multiple Exhaust Gas Temperature sensors for DPF control. Diagnostic references such as the Ross‑Tech Wiki and the Audi ETKA parts catalogue also document these sensors and their roles across 2.0 TFSI, 3.2 FSI, and 2.0 TDI variants.

In day‑to‑day driving, these sensors let the ECU trim fuel and ignition, manage turbo and emissions systems, and control the radiator fans and thermostat strategy. If one goes out of range, you’ll often see hard starting, rough idle, higher fuel use, cooling fans running flat‑out, limp mode on diesels, or a check‑engine light.

While temperature sensors aren’t a scheduled replacement item, they’re worth a check during major services, especially on higher‑kilometre Q5s. A quick scan with a proper diagnostic tool to compare live temperature readings (cold‑soak equality, plausible rise during warm‑up) is the simplest health check. On TDI models, keep an eye on EGT sensor plausibility if you’re seeing frequent DPF regens.

• Replacement tips: Use quality OEM‑equivalent parts, replace any O‑rings, and lightly lube seals to avoid nicks. For the coolant temp sensor, work on a cool engine, catch/replace coolant as needed, and bleed the system properly.
• Handling and torque: Many housings are plastic—don’t overtighten. Release connectors by the tab, not the wires.
• Aftercare: Clear fault codes, verify live data, and confirm the radiator fans and temperature gauge behave normally on a road test.

Common fault codes tied to these sensors include P0117/P0118 (ECT circuit), P0112/P0113 (IAT circuit), and various EGT plausibility codes on diesels. If a sensor’s reading is implausible, test wiring and grounds before condemning the sensor itself—Audi’s service manuals stress circuit tests first to avoid unnecessary parts swaps.

Technical sources referenced: Audi erWin/ELSA factory service information for 2011 Q5 engines (G62, G17, EGT sensor coverage), Ross‑Tech Wiki diagnostic entries for ECT/IAT/EGT sensors on Audi platforms, and Audi ETKA parts catalogue confirming fitment across 2.0 TFSI, 3.2 FSI, and 2.0 TDI Q5 models.

FAQs

Where are the temperature sensors on a 2011 Audi Q5?

Coolant temp (G62) is mounted in the cooling circuit near the thermostat/housing. Intake air temp is typically integrated in the MAF or charge tract. Ambient temp (G17) sits behind the front bumper or grille. TDI models add exhaust gas temperature sensors pre‑ and post‑turbo/DPF along the exhaust.

Access varies by engine, front under‑trays and air‑ducting may need removal for safe access.

How do you know a Q5 temperature sensor has failed?

Symptoms include hard cold starts, rich running, excessive fan operation, erratic gauge behaviour, DPF regen issues on diesels, and a check‑engine light. A scan tool showing implausible values (e.g., −40°C or 130°C at cold‑soak) is a giveaway.

Confirm wiring integrity and connectors before replacing the sensor.

Is it safe to drive with a faulty temperature sensor?

Short distances may be possible, but it’s not recommended. The ECU may default to rich or protective strategies, increasing fuel use and potentially harming the catalytic converter or DPF. Overheating risk also rises if cooling control is affected.

Get it diagnosed and sorted promptly to protect the engine and emissions systems.