The default code P1392 is a generic OBD-II code related to a problem with synchronization between the crankshaft and camshaft, similar to P1391 but with specificities depending on the manufacturer. It can affect engine performance and trigger the “Check Engine” light.
1. Meaning of Code P1392
The code P1392 generally means:
- “Error in correlation between the crankshaft position sensor (CKP) and the camshaft position sensor (CMP)”
- “Engine timing or synchronization problem”
Difference between P1391 and P1392:
- P1391 → Slight desynchronization (e.g., off by one tooth).
- P1392 → More significant desynchronization (e.g., multiple teeth off or serious mechanical issue).
2. Possible Causes of P1392
A. Mechanical Problems (most common)
🔧 Misaligned timing belt/chain (misalignment, slippage, wear)
🔧 Faulty chain tensioner or guide (chain engines)
🔧 Stuck or faulty variable valve timing (VVT) actuator
B. Sensor Failures
📡 Faulty camshaft position sensor (CMP)
📡 Defective crankshaft position sensor (CKP)
📡 Dirty or damaged sensors
C. Electrical Problems
🔌 Cut wires, oxidized connectors, or short circuits
🔌 Sensor power supply issue
D. Other Causes
🛢️ Insufficient or poor-quality engine oil (affects VVT)
💻 ECU failure (rare)
3. Diagnosis and Solutions
Step 1: Check the Timing Belt/Chain
- Check alignment marks (crankshaft and camshaft).
- If the belt/chain is misaligned or worn, replace and recalibrate it.
- On chain engines (e.g., VW 1.4 TSI, BMW N20): check for stretching and the tensioner.
Step 2: Test the CKP and CMP Sensors
- Measure resistance with a multimeter (specific values per model).
- Clean or replace faulty sensors.
Step 3: Inspect Wiring and Connectors
- Check for broken or oxidized wires.
- Clean connectors with contact spray.
Step 4: Check the VVT Actuator and Engine Oil
- Check oil level and quality (old oil can block VVT).
- If the VVT is faulty, replace it.
Step 5: Reset and Test
- Clear the code with an OBD2 tool.
- Perform a road test to see if the code returns.
4. Affected Manufacturers (examples)
- Volkswagen/Audi/Seat/Skoda: Timing or sensor issues.
- BMW/Mini: Stretched timing chain (e.g., N47/N63 engines).
- Toyota/Lexus: Faulty VVT-i actuator.
- Honda: Timing or CMP sensor problem.
5. Conclusion
The code P1392 generally indicates:
✅ A timing issue (timing system) → Check belt/chain.
✅ A faulty CMP/CKP sensor → Test and replace.
✅ An electrical or VVT problem → Inspect wiring and oil.
⚠️ If the problem persists after checking, professional diagnosis with an oscilloscope may be necessary.