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17552 – Mass Air Flow Sensor (G70) Open/Short to Ground (VAG 1.9 TDI (PD and VE), 1.8T, 1.6 / 2.0 petrol)

On VAG vehicles, fault code 17552 (OBD2: P1144) means "Mass Air Flow Sensor (G70) Open/Short to Ground". It is common on 1.9 TDI (PD and VE), 1.8T, 1.6 / 2.0 petrol, Golf IV, Bora, Passat B5, Audi A3 8L, A4 B5/B6, A6 C5, Octavia I, Fabia I, Leon 1M engines. Below are the real-world causes, step-by-step tests and OEM part numbers.

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17552 quick summary

Fault code17552
OBD2 codeP1144
MeaningMass Air Flow Sensor (G70) Open/Short to Ground
SystemPowertrain (Engine & Transmission)
VehiclesVAG (VW, Audi, Škoda, Seat)
Common on1.9 TDI (PD and VE), 1.8T, 1.6 / 2.0 petrol, Golf IV, Bora, Passat B5, Audi A3 8L, A4 B5/B6, A6 C5, Octavia I, Fabia I, Leon 1M
SeverityMedium
Can I drive?Yes, but the engine runs on substitute values with reduced power. Have it fixed soon.
Repair cost€10 – €250

Symptoms of 17552

  • Engine warning light
  • Reduced power, especially on TDI engines
  • Hesitation when accelerating
  • Black smoke (TDI)
  • Engine runs better with the MAF unplugged (classic MAF fault sign)

Most common causes of 17552 (most likely first)

Mechanic's Pro Tip

17552 is an electrical fault: the engine control unit sees no plausible signal from the MAF (G70). Check the 5-pin connector first – broken wires right behind the connector and corroded pins are very common on older VAG cars. If the wiring is good, measure the supply (12 V and 5 V reference) before replacing the sensor.

  1. 1.Faulty MAF sensor (G70)

    Most likely

  2. 2.Broken wire behind the MAF connector

  3. 3.Corroded or loose connector pins

  4. 4.Missing supply voltage (fuse or relay)

  5. 5.Short to ground in the harness

Step-by-step diagnostic guide

  1. 1

    Read codes with VCDS or another VAG-capable tool and check the MAF value in measuring blocks at idle.

  2. 2

    Inspect the connector and wiggle-test the wiring with the engine running.

  3. 3

    Measure the 12 V supply, the 5 V reference and ground at the connector.

  4. 4

    Check fuses and the engine relay supply.

  5. 5

    Replace the MAF or repair the wiring, clear codes and test drive.

How do I read fault codes? →Where the OBD2 port is, which scanner to use and how to read and clear codes step by step.

Frequently asked questions

What is the difference between 17552 and 16486?

16486 (P0102) means the signal is too low, often a dirty or weak sensor. 17552 (P1144) points more to an open or short in the circuit.

Can I drive with the MAF unplugged?

The engine runs on substitute values, but with less power and higher fuel use. It is only a diagnostic test, not a fix.

Related fault codes

This guide is for information only. Working on vehicles can be dangerous — if you are unsure, have the car checked by a qualified mechanic. Values can differ between model years; always check the manufacturer's repair information.