DTC P2247: Oxygen Sensor Upstream Of Catalytic Converter, Bank 2: Open Circuit In Signal (Re+/IPN): Notes

Diagnostic information - DME (DFI) control unit

NOTE: Plug connection disconnected = reference-air duct open!
Damage to oxygen sensor!

DO NOT use spray, grease, fluid or similar products on the oxygen sensor plug connections.

INFORMATION

Do not interchange the oxygen sensor upstream of the catalytic converter with the sensor downstream of the catalytic converter as this will result in implausible fault entries.
The connectors themselves are coded and cannot be interchanged.