Meaning of P1393 Volkswagen

The P1393 code on Volkswagen vehicles has a different meaning depending on the model and year, but generally relates to the crankshaft position (CKP) or camshaft position (CMP) system. The most common interpretations include:

• “Crankshaft Position Sensor – Intermittent Signal”
• “Camshaft Position Sensor – Performance Problem”
• “Ignition Coil ‘D’ Primary/Secondary Circuit” (Ignition coil circuit problem on certain models)

Main Causes

1. Electrical Problems

• Faulty CKP or CMP sensor (wear, internal damage)
• Damaged wiring (cut wires, chafing, corrosion)
• Oxidized or loose connectors
• Electrical ground problem

2. Mechanical Problems

• Damaged teeth on the flywheel or camshaft wheel
• Excessive bearing clearance of crankshaft/camshaft
• Timing problem (timing belt/chain)

3. Other Causes

• Defective ignition coil (on some interpretations of the code)
• ECU problem (rare)
• Electromagnetic interference

Common Symptoms

• 🚗 Hard starting (especially when cold)
• 🔄 Unstable idle
• ⚡ Random misfires
• 🐌 Loss of power
• ⚠️ Check engine light illumination
• 🔥 Increased fuel consumption

Diagnostic Procedure

Step 1: Reading Additional Codes

• Check for other fault codes (P0340, P0335, etc.)
• Consult fault history

Step 2: Visual Inspection

1. CKP/CMP Sensors:

• Location (varies by engine)
• Check mounting and physical condition

1. Wiring:

• Follow the cable routing
• Look for chafing areas

1. Connectors:

• Check for oxidation/corrosion
• Test contact quality

Step 3: Electrical Tests

• Resistance test of sensors (typical values: 200-1000Ω)
• Voltage measurement:
• Power supply (5V or 12V depending on model)
• Signal (AC voltage during engine rotation)
• Continuity test of circuits

Step 4: Mechanical Analysis

• Visual inspection of flywheel teeth
• Check of crankshaft axial play
• Timing inspection (mark alignment)

Recommended Solutions

1. Replacement of Faulty Components

• CKP/CMP sensor (use OEM parts)
• Ignition coil if affected
• Repair wiring with heat shrink tubing

2. Mechanical Repairs

• Replacement of flywheel if teeth are damaged
• Timing adjustment if necessary

3. Reset

• Clear fault codes
• Perform adaptation if necessary (with VCDS/ODIS)

Affected Volkswagen Models

This code can appear on various models, including:

• Golf/Jetta (MK4-MK7)
• Passat (B5-B8)
• Tiguan
• Polo
• Models equipped with engines:
• 1.8T, 2.0T
• TDI (1.9L, 2.0L)
• FSI/TSI engines

Recommended Tools

• VCDS (VAG-COM) for in-depth diagnosis
• Oscilloscope for signal analysis
• Quality digital multimeter

Important note: Some interpretations of this code may vary depending on the ECU version. Model-specific documentation is recommended for accurate diagnosis.