Parts for your 2020 Audi Q5-Camshaft sensor

2020 Audi Q5 camshaft sensor — what it does and how to look after it

Based on technical sources used by workshops, the 2020 Audi Q5 does use a camshaft position sensor. Audi’s factory workshop information (erWin) for the FY-platform Q5 lists the camshaft position sensor (commonly labelled G40 and, on V6 engines, one per bank) in the engine management wiring diagrams. The Audi/VW parts catalogue (ETKA) also shows camshaft sensors for the 2.0 TFSI EA888 four‑cylinder and the 3.0 TFSI EA839 V6 used in SQ5 variants. Factory diagnostic routines reference DTCs such as P0340–P0344 for camshaft position circuits on these engines, confirming the sensor is fitted and monitored by the ECU.

On the 2020 Audi Q5, the camshaft sensor is a Hall-effect device that tells the ECU exactly where the cam(s) sit relative to the crank. That timing snapshot is essential for quick starts, smooth idle, precise fuel injection on a direct‑injection petrol, accurate ignition timing, and to control variable valve timing. It also helps with emissions, start/stop behaviour, and misfire monitoring. If the signal goes walkabout, the car can take longer to crank, feel doughy off the line, drop into limp mode, or throw an EPC/check‑engine light.

This isn’t a regular replacement item, but it does deserve a look during routine servicing. Under the bonnet, the sensor lives on the cylinder head: on the 2.0 TFSI there’s typically one at the end of a camshaft, on the V6 there’s one per bank. Heat and a light mist of oil over time can harden the O‑ring or wick into the connector. A quick visual once-over at service time—checking the plug for oil, the wiring for chafe, and the sensor for cracking—goes a long way. If there’s a fault code, verify basics first: battery health, timing correlation, connector tension, and loom integrity.

When replacement is needed, it’s a straightforward spanner job for most technicians: remove the engine cover, unplug the connector, back out the retaining fastener, twist and pull the sensor, lightly oil the new O‑ring, seat it square, and tighten to the factory torque. Use a genuine or high‑quality OE‑equivalent sensor, clear fault codes, and run basic settings if the scan tool recommends it. No special coding is usually required. After the swap, a short road test to confirm clean live data and no returning DTCs is the go.

Typical warning signs that point to a crook camshaft sensor on a 2020 Q5 include:

• Hard starting, rough idle, or sudden stalling at low speed
• Flat spots, poor fuel economy, or the engine stuck in a reduced‑power mode
• Check‑engine/EPC lamp with camshaft correlation or circuit codes

If any of that sounds familiar, it’s worth getting it scanned before it gets worse—leaving it can stress the catalytic converter and waste fuel. With the right part and process, repairs are quick and tidy.

Popular questions about the 2020 Audi Q5 camshaft sensor

Where is the camshaft sensor on a 2020 Audi Q5?
On the 2.0 TFSI four‑cylinder, it’s mounted on the cylinder head near the timing end, access is usually from the top after removing the engine cover. On the V6 (SQ5), there’s one sensor per bank on the fronts of the heads. Exact position can vary by engine code, so a quick check of the workshop guide helps.

Do I need to replace it as part of regular servicing?
No. It’s not a scheduled service item. Instead, inspect the connector, wiring and O‑ring at normal service intervals. Replace the sensor only if it’s faulty or contaminated by oil, and address any leaks that might recur.

Is it safe to drive with a failing camshaft sensor?
It often will run, but you may get hard starts, rough running, and poor economy, and it can stall at awkward times. Best to sort it promptly to avoid further issues and to keep emissions gear happy.