Parts for your 2019 Audi Q5-Maf sensor

2019 Audi Q5 MAF sensor: what’s fitted and what to service

Based on Audi factory repair information (ElsaWin), the Audi parts catalogue (ETKA), and Audi Self‑Study Programme material for the FY-platform Q5 engines, plus Bosch engine-management documentation for EA888/EA839 petrol and EA288 diesel systems, the 2019 Audi Q5 may or may not use a mass air flow (MAF) sensor depending on the engine. Petrol models (45 TFSI 2.0 TFSI EA888 Gen 3B and SQ5 3.0 TFSI EA839) run speed‑density strategies and do not use a traditional MAF. The 2.0 TDI (40 TDI, EA288) is fitted with a hot‑film MAF (often listed as “air mass meter, G70”) in the intake duct.

Why the petrol Q5 doesn’t use a MAF: the EA888 Gen 3B and EA839 engines rely on manifold and charge‑air pressure/temperature sensors (MAP/T‑MAP) and wideband oxygen sensors to model air mass. That approach improves response, packaging, and resilience to oil mist contamination ahead of the turbo. It’s well supported by the Bosch MED/Simos control strategy and Audi’s calibration, so there’s simply no need for a separate MAF under the bonnet on those petrol variants.

For the diesel Q5 (40 TDI), the MAF is part of the emissions and drivability backbone. Here’s what owners should know about the part and its care.

The MAF on the 2019 Q5 2.0 TDI measures the actual mass of air entering the engine so the ECU can meter fuel precisely, manage EGR flow, and keep the diesel particulate filter happy. Accurate airflow data helps cold starts, smooth idle, clean acceleration, and keeps soot down during around‑town kilometres. When the sensor drifts or gets dirty, the car can feel flat, surge at light throttle, or throw airflow/EGR plausibility codes (think P0101 territory). Fuel economy can slide and DPF regens may happen more often than they should.

Service tips: keep the air filter on time and use a quality element, over‑oiled aftermarket filters can foul the hot film. If readings look off in diagnostics or there’s a clear drivability change, remove the sensor and clean it with dedicated MAF cleaner only—never brake or throttle cleaner, and don’t touch the sensing wire. If cleaning doesn’t restore stable readings, replacement is straightforward: the unit sits between the airbox and the intake pipe with an electrical plug and a couple of fasteners. Fit a reputable part (genuine or OE supplier), check the intake duct and clamps for leaks, and clear any fault codes. It’s good practice to perform an airflow/adaptation reset with a scan tool so the ECU relearns properly.

A few quick tells of a tired MAF on the diesel:

• Hesitation or a slightly “fluffy” throttle feel
• Higher fuel use and a bit more smoke under load
• Airflow/EGR fault codes and frequent DPF regens

Done right, a clean, sealed intake and a healthy MAF keep the 40 TDI pulling smoothly and efficiently across Aussie and Kiwi roads.

FAQs

Does a 2019 Audi Q5 45 TFSI have a MAF sensor?
No. The 45 TFSI (petrol) uses MAP and temperature sensors to calculate airflow, backed by wideband O2 feedback. If someone’s hunting for a MAF under the bonnet on this model, they won’t find one.

Where is the MAF on a 2019 Q5 40 TDI and how hard is it to replace?
It’s mounted in the intake tube just downstream of the airbox. Replacement is a basic driveway job with Torx bits: unplug, remove the fasteners, swap the unit, then reconnect. After fitting, clear codes and, ideally, run an adaptation reset with a scan tool.

Can a dirty MAF cause EGR or DPF issues on the diesel?
Yes. Skewed airflow readings upset EGR control and can increase soot, leading to more frequent DPF regenerations and possible fault codes. Keeping the MAF clean and the air filter fresh helps the emissions system behave.