P0698

Symptoms

• Check Engine Light
• Multiple sensor error codes
• Unstable engine operation
• Low readings from group C sensors
• Switching to emergency engine operation mode

Causes

• Partial short circuit to ground in one of the sensors of group C
• Damage to voltage reference circuit wiring C
• Sensor malfunction with internal ground leakage
• Oxidation or damage to connectors
• Internal ECU malfunction (weak reference voltage)

How to Fix

1. Read all OBD-II codes and record the complete list
2. Identify all sensors connected to circuit C according to the electrical diagram
3. Measure the voltage on reference line C (normal: 5V)
4. Turn off group C sensors one by one and monitor voltage restoration
5. Find and replace a faulty sensor or repair damaged wiring
6. If all sensors are working properly, diagnostics and replacement of the ECU

Related codes

Error P0698 by Vehicle Brand