1. Meaning of Audi Code P1392
Code P1392 corresponds to:
“Crankshaft Position Sensor (CKP) and Camshaft Position Sensor (CMP) Mismatch – Intermittent Error”
This fault indicates that the engine control unit (ECU) detects a temporary or permanent inconsistency between the signals from the two sensors, which can disrupt:
- Ignition timing
- Fuel injection
- VVT system management (if equipped)
⚠️ Risks:
- Unstable idle
- Loss of power
- Catalytic converter damage
- In severe cases, piston-valve collision (on some interference engines)
2. Possible Causes of P1392 on Audi
(Ranked by frequency)
A. Electrical Problems (50% of cases)
- Faulty CMP sensor (camshaft) (common on 2.0 TFSI)
- Intermittent CKP sensor (crankshaft)
- Damaged wires or connectors (oxidation, chafing)
- Poor electrical ground
B. Mechanical Problems (35% of cases)
- Stretched timing chain (1.8T, 2.0T, 3.0T engines)
- Worn chain tensioner or guide
- Variable valve timing (VVT) actuator problem
- Oil pump failure (insufficient pressure)
C. Other Causes (15%)
- Timing issue after engine reassembly
- Defective ECU (rare)
- Engine oil too old or poor quality
3. Step-by-Step Diagnosis
Step 1: Data Reading with VCDS/OBD2
- Check real-time values of CKP/CMP sensors
- Look for associated codes (e.g., P0016, P0340)
Step 2: Visual Inspection
- Check sensor connectors (CMP often near cylinder head, CKP near flywheel)
- Inspect wiring condition (especially near hot components)
Step 3: Sensor Testing
| Sensor | Test | Normal Value |
|---|---|---|
| CMP | Resistance | 500-1500 Ω (depending on model) |
| CKP | Voltage (AC) | 0.5-3V during cranking |
| Power Supply | +12V Voltage | 12V with ignition ON |
Step 4: Mechanical Check
- Check chain tension (special tool or sprocket marking)
- Inspect tensioner and guides
- Verify oil pressure (min. 2 bars at idle)
4. Recommended Repairs by Model
Audi A4/A5/Q5 (2.0 TFSI)
- Recurring problem: Stretched chain after 120,000 km
- Solution: Chain kit + tensioner (approx. €800-1200)
Audi A6/A7/Q7 (3.0 TDI)
- Frequent problem: CMP sensor flooded with oil
- Solution: Replace sensor + gasket (€150-300)
Audi TT/TTS (1.8T)
- Known issue: CMP harness chafed near exhaust
- Solution: Repair wiring + heat shield
5. Mistakes to Avoid
❌ Ignoring the code → Risk of engine damage
❌ Using low-quality sensors → Prefer Bosch or OEM
❌ Forgetting to check oil → An oil change may solve the problem
6. Average Repair Costs
| Problem | Cost (parts + labor) |
|---|---|
| CMP sensor replacement | €150-400 |
| Complete chain kit | €800-2000 |
| Connector cleaning | €50-100 |
7. FAQ
Q: Can I drive with a P1392?
→ No, except to go to the garage. Risk of engine damage.
Q: The code returns after clearing, what to do?
→ Check timing chain and sensors with an oscilloscope.
Q: Is it related to the timing belt?
→ No, except on very old models. Most recent Audis have a chain.
Conclusion
Code P1392 on Audi requires verification in 3 steps:
- Electrical diagnosis (sensors, wiring)
- Mechanical check (chain, tensioner)
- Oil/ECU verification
🔧 For accurate diagnosis, specify:
- Exact model and year
- Mileage
- Associated codes
(This article is valid for most gasoline and diesel Audis. Consult a professional for a tailored diagnosis.)