P1190 — Volkswagen — Linear Oxygen Sensor Reference Voltage Incorrect Signal

Linear Oxygen Sensor Reference Voltage Incorrect Signal. Source catalogue definition; confirm applicability using vehicle service information.

Affected system: Powertrain

Symptoms

• Check Engine light illumination
• Rough engine idling
• Increased fuel consumption
• Poor engine performance or hesitation
• Inaccurate air-fuel ratio readings

Possible causes

• Damaged oxygen sensor wiring harness
• Corroded sensor electrical connectors
• Faulty linear oxygen sensor
• Defective Engine Control Module (ECM) sensor circuit
• Short circuit or open circuit in the reference voltage supply line

What to check

• Inspect the oxygen sensor wiring harness for visible damage or melting.
• Verify electrical connections at the sensor for signs of corrosion or moisture.
• Measure the reference voltage at the sensor connector using a digital multimeter.
• Check for continuity between the oxygen sensor connector and the engine control module.
• Test the oxygen sensor signal output against manufacturer specifications.