What does code P1122 mean?

Q: What does code P1122 mean?

Oxygen Sensor Heater Circuit Bank 2 Sensor 2 Open. P1122 on a Volkswagen indicates that the engine control module (ECM) has detected an open circuit in the heater element of the downstream oxygen sensor on bank 2, which is the sensor after the catalytic converter. The ECM monitors the heater circuit for expected current flow when the heater is commanded on, and an open circuit means no current is flowing, so the sensor cannot reach operating temperature.

DTC codes / Volkswagen codes / P1122

P1122 · VolkswagenOxygen Sensor Heater Circuit Bank 2 Sensor 2 Open

P1122 on a Volkswagen indicates that the engine control module (ECM) has detected an open circuit in the heater element of the downstream oxygen sensor on bank 2, which is the sensor after the catalytic converter. The ECM monitors the heater circuit for expected current flow when the heater is commanded on, and an open circuit means no current is flowing, so the sensor cannot reach operating temperature.

SystemPowertrain

Code typeVolkswagen specific

SeverityLow

Fix difficultyIntermediate

AreaFuel and air metering

Guidance is general and written for Volkswagen vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.