17748 – Crankshaft/Camshaft Position Sensor Signals Out of Sequence (VAG 1.8T 20V, 1.8 / 2.0 8V, 1.6 8V)
On VAG vehicles, fault code 17748 (OBD2: P1340) means "Crankshaft/Camshaft Position Sensor Signals Out of Sequence". It is common on 1.8T 20V, 1.8 / 2.0 8V, 1.6 8V, 1.9 TDI PD and VE, Golf IV, Bora, Passat B5, Audi A3 8L, A4 B5/B6, Octavia I engines. Below are the real-world causes, step-by-step tests and OEM part numbers.
Last updated
17748 quick summary
| Fault code | 17748 |
|---|---|
| OBD2 code | P1340 |
| Meaning | Crankshaft/Camshaft Position Sensor Signals Out of Sequence |
| System | Powertrain (Engine & Transmission) |
| Vehicles | VAG (VW, Audi, Škoda, Seat) |
| Common on | 1.8T 20V, 1.8 / 2.0 8V, 1.6 8V, 1.9 TDI PD and VE, Golf IV, Bora, Passat B5, Audi A3 8L, A4 B5/B6, Octavia I |
| Severity | High |
| Can I drive? | Only to a workshop. If the timing belt has jumped a tooth, further driving can cause valve damage. |
| Repair cost | €50 – €900 |
Symptoms of 17748
- Check Engine light
- Hard starting or long cranking
- Loss of power, rough running
- Engine runs only in limp mode
- Rattle or noise from the timing belt area
Most common causes of 17748 (most likely first)
Mechanic's Pro Tip
This code means the engine control unit sees the camshaft and crankshaft signals in the wrong relationship. On VAG engines with a timing belt, the most likely cause is a belt that has jumped one tooth or a worn tensioner – check the timing marks before replacing sensors. A loose camshaft sensor trigger wheel or a damaged crankshaft sensor ring are less common causes.
1.Timing belt jumped a tooth or stretched / worn tensioner
Most likely2.Faulty camshaft position sensor (Hall sender G40)
3.Faulty crankshaft position sensor (G28) or damaged trigger ring
4.Loose or damaged camshaft sensor trigger wheel
5.Wiring fault to the sensors
Step-by-step diagnostic guide
- 1
Read all codes and check the cam/crank alignment value in the measuring blocks if available.
- 2
Check the timing marks on the crankshaft and camshaft with the engine at TDC.
- 3
Inspect the timing belt and tensioner condition.
- 4
Check the camshaft and crankshaft sensor signals and wiring (oscilloscope if possible).
- 5
Correct the timing or replace the belt kit / faulty sensor; clear codes and test.
Frequently asked questions
Does 17748 always mean the timing belt?
Not always, but it is the most important thing to check because a jumped belt can damage the engine. Sensors and their trigger wheels are the other causes.
Is 17748 the same as P0016?
The meaning is similar – cam and crank signals do not match. 17748/P1340 is VAG's own code used on older models.
Related fault codes
- P001600Crankshaft / Camshaft Position Correlation (Bank 1 Sensor A)
- P0340Camshaft Position Sensor Circuit Malfunction
- 16684Random/Multiple Cylinder Misfire Detected (Older VAG 5-Digit Code)
- 17544Long Term Fuel Trim Add. Air, Bank 1: System Too Lean
- 17705Pressure Drop Between Turbocharger and Throttle Valve
- 17964Charge Pressure Control: Negative Deviation (Underboost)
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.