1. Specific Meaning of Audi P1393
The P1393 code on Audi vehicles indicates:
“Camshaft Position (CMP) Sensor Circuit Performance Malfunction – Bank 1”
Audi Specifics:
- Primarily affects FSI, TFSI, and TDI engines
- Can disrupt the Variable Valve Timing (VVT) system
- Impacts engine performance and fuel consumption
2. Affected Audi Models
| Model | Engine | Years | Critical Mileage |
|---|---|---|---|
| A4 | 2.0T FSI (EA888) | 2008-2016 | 80,000-140,000 km |
| A6 | 3.0T TFSI (EA839) | 2017-2023 | 60,000-100,000 km |
| Q5 | 2.0TDI (EA189) | 2009-2017 | 120,000-180,000 km |
| A3 | 1.8T (EA888 Gen3) | 2014-2020 | 70,000-120,000 km |
3. Main Causes
A. Electrical Problems (70%)
- Faulty CMP sensor (Audi ref. 06F-907-311-C)
- Damaged wiring (critical area: engine harness routing)
- Oxidized connector (T14a/T17a)
- Power supply issue (voltage outside 4.5-5.5V)
B. Mechanical Problems (25%)
- Metal deposits on the tone wheel
- Excessive play in the camshaft
- Timing chain problem (stretching)
C. Other Causes (5%)
- ECU failure (rare)
- Electromagnetic interference
- Contaminated engine oil
4. Diagnostic Procedure
Step 1 – Initial Checks
- Check oil level (VW 502/505 viscosity)
- Visual inspection of CMP sensor and wiring
- Check for associated codes (P0340, P0016, etc.)
Step 2 – Electrical Tests
| Test | Method | Normal Values |
|---|---|---|
| Supply voltage | Multimeter (ignition ON) | 5V ±0.5V |
| CMP resistance | Multimeter (disconnected) | 500-1500 ohms |
| Output signal | Oscilloscope (VCDS ideal) | Clean square wave |
Step 3 – Advanced Checks
- CMP data analysis with VCDS/ODIS
- Mechanical timing verification
- Circuit continuity test to ECU
5. Specific Solutions
For EA888 (2.0T FSI)
- CMP sensor replacement (revised version)
- Harness inspection (common chafing area)
- ECU connector cleaning
For EA839 (3.0T TFSI)
- Timing adjuster verification
- Chain tension check
- Software update
For EA189 (2.0TDI)
- Tone wheel cleaning
- Oil pump verification
- CMP seal replacement
6. Technical Data
- Sensor torque: 9 Nm
- Inspection interval: 100,000 km
- Minimum oil pressure: 2.0 bar (hot idle)
7. Repair Costs
| Service | Cost (EUR) | Warranty |
|---|---|---|
| Sensor replacement | 150-300€ | 2 years |
| Wiring repair | 200-500€ | 1 year |
| Audi diagnostic | 90-180€ | – |
8. Mistakes to Avoid
- Using non-OEM sensors (40% failure rate)
- Neglecting wiring inspection
- Forgetting to reset adaptations
9. Technical FAQ
Q: Risk to the engine?
→ Possible VVT damage if ignored
Q: Can I drive temporarily?
→ Maximum 50 km at low RPM
Q: Difference between P1393 and P0340?
→ P1393 = performance issue, P0340 = open circuit
10. Post-Repair Procedure
- Clear codes with VCDS
- Perform break-in cycle:
- 20 min at 2000-2500 RPM
- 3 engine starts/stops
- Check CMP parameters
11. Prevention Tips
- Strict oil changes (15,000 km max)
- Annual wiring inspection
- Use of specific Audi oil
- Connector cleaning every 2 years
12. Conclusion
To resolve P1393 on Audi:
- Complete diagnosis with VCDS/ODIS
- Thorough electrical verification
- Use of Audi/VW OEM parts
⚠️ Important: Recurring problems often require full engine harness inspection. Consult a certified Audi technician for complex cases.