OBD2 codes.
A code identifies a signal or system that needs to be checked, not a part you should replace.
Got an OBD2 Bluetooth adapter? Read the codes straight from your car.1 code entry · 1 related fault
P0019The exhaust camshaft is out of sync with the crankshaft (bank 2)Urgency high
Crankshaft Position - Camshaft Position Correlation (Bank 2 Sensor B)
The crankshaft (turned by the pistons) and the camshafts (which open the valves) turn linked by the timing chain or belt. This code means the sensor B camshaft —usually the exhaust one— on bank 2 (the side opposite cylinder 1, only on V engines) is not in the position that matches the crankshaft.
What the car has detected
The engine computer compares the crankshaft and camshaft sensor signals and has seen the cam running advanced or retarded by more degrees than allowed.
The most serious cause is a stretched timing chain or one that has jumped a tooth: if it gets worse, the valves can hit the pistons and wreck the engine. Avoid long trips and get it to a garage as soon as possible.
Symptoms
- Engine warning light on
- Chain noise or rattle, especially on cold start
- Rough idle or hesitation
- Loss of power or limp mode
- Hard starting
Possible causes
- Stretched timing chain (common at high mileage) or one that has jumped a tooth
- Worn timing tensioner or guides
- Stuck camshaft phaser (variable timing) or its control valve
- Low, old or wrong-viscosity oil that doesn't feed the phaser properly
- Faulty camshaft or crankshaft sensor, or a shifted reluctor wheel
- Timing assembled incorrectly after a repair
Checks for the garage
- Ask whether engine or timing work was done recently
- Check the oil level and condition
- Compare requested and actual cam angle in live data
- Look for other timing codes: several at once point to the main chain
- Verify the timing marks per the manual and the condition of chain and tensioners
- Check the phasers and their control valves
Next step
Check the oil level and have the timing (chain or belt, tensioners) and the camshaft phaser checked.
Go to a garage as soon as possible, especially if you can hear the chain. Checking timing and the chain needs specific tools and the engine manual.
Original sources · Date indicated: 2026-10-12
Related faults in the database
4.2 V8 rear chains and carbon build-upTiming / intake
- Engine / equipment
- 4.2 V8 40-valve (S4 B6/B7) and 4.2 FSI V8 (RS4 B7, S5 8T until 2011, RS5, R8, Q7 4L)
- Period mentioned
- 2003–2015
- Symptoms
- Rattle from the rear of the engine on a cold start, misfires or an engine light for timing deviation; on FSI engines, power loss and rough idle from carbon build-up.
- Possible cause described
- The timing chains sit at the rear of the engine, against the bulkhead, with plastic guides and tensioners that crack; replacing them means removing the engine. FSI direct injection builds carbon on the intake valves from about 40,000–60,000 km.
- Check for the garage
- Listen to a cold start, read crank-cam correlation codes and inspect the intake valves with a borescope.
- Cost cited in the source
- Chains (engine out): approx. €6,500–11,000 on a Q7 4.2 FSI (converted from dollars); carbon cleaning: far lessA rough figure from the original database, not an up-to-date quote.
Mileage cited in the database: from 40,000 km. This is not a maintenance interval and does not predict a failure.