Parts for your 2015 Audi Q5-Throttle position sensors

2015 Audi Q5 throttle-position-sensors: what they do and how to look after them

Based on Audi’s own technical literature and common diagnostic coverage, the 2015 Audi Q5 (Type 8R) does use throttle-position-sensors — they’re built into the electronic throttle body. Audi ErWin workshop manuals for the 8R platform describe the Throttle Valve Control Module (J338) with two internal throttle-position-sensor tracks (G187/G188) for redundancy. Audi Self-Study Programmes on drive-by-wire engines (covering EA888 2.0 TFSI, EA837 3.0 TFSI, and the 3.0 TDI intake throttle) outline this dual-sensor setup, and common DTCs listed by professional diagnostic sources (e.g., P0121, P0122, P0221) explicitly reference these sensors. So, throttle-position-sensors are absolutely relevant on a 2015 Q5 — they’re just not a separate bolt-on unit, they live inside the throttle body.

On this model, the throttle-position-sensors tell the engine control unit exactly where the throttle plate sits, so commanded angle and actual angle match. With drive-by-wire under the bonnet, the ECU compares the two internal sensor signals for plausibility, delivering smooth throttle response, stable idle, and emissions control. If one track goes out of range, the Q5 can chuck an EPC light, drop into limp mode, or feel flat when accelerating.

Servicing-wise, the throttle-position-sensors aren’t a regular replacement item. They’re part of the throttle body assembly, so if the sensor fails, the usual fix is to replace the complete electronic throttle body with a new gasket. After any replacement — and often after cleaning — a throttle adaptation needs to be performed with a proper scan tool (ODIS or VCDS) so the ECU relearns end stops. A key-on wait may sometimes work, but it’s hit-and-miss, a guided basic setting is the tidy way to do it.

Good maintenance under Aussie and Kiwi conditions looks like this:

• Keep the throttle bore clean if there’s sticky buildup or unstable idle. Use a throttle-safe cleaner and don’t flood the electronics.
• Inspect the connector and loom for corrosion or chafing if you see intermittent EPC lights.
• Maintain a strong battery/charging system, low voltage can trigger spurious throttle faults.
• Scan for codes such as P0121/P0122/P0123, P0221, or P2101 and follow factory test plans before replacing parts.

If replacement is needed, follow the factory torque specs, fit a new gasket, and complete adaptation. Also note the accelerator pedal has its own position sensors (G79/G185) — different part, similar idea — so correct diagnosis matters before ordering a throttle body.

• Where is the throttle-position-sensor on a 2015 Audi Q5?
• Can the throttle-position-sensor be cleaned, or does it need replacing?
• Do I need a throttle adaptation after cleaning or replacing the throttle body?

Where is the throttle-position-sensor on a 2015 Audi Q5?

It’s integrated into the electronic throttle body on the intake, not a separate sensor. Audi labels the internal dual tracks as G187 and G188 within the Throttle Valve Control Module (J338). If it fails, the whole throttle body assembly is typically replaced.

Can the throttle-position-sensor be cleaned, or does it need replacing?

You can clean carbon from the throttle bore to fix sticky idle or slow return-to-idle, but the internal sensor elements aren’t serviceable. If diagnostics point to sensor faults (e.g., P0121/P0221) after wiring checks, replace the throttle body and perform adaptation.

Do I need a throttle adaptation after cleaning or replacing the throttle body?

Yes. After cleaning or any replacement, run a throttle adaptation with a suitable scan tool so the ECU relearns the end stops and idle control. This helps avoid rough idle, EPC lights, or high idle after servicing.