What does code P21A6 mean?

Q: What does code P21A6 mean?

Cylinder 11 Air-Fuel Ratio Imbalance. P21A6 indicates that the powertrain control module has detected an air-fuel ratio imbalance on cylinder 11, meaning that cylinder's combustion is deviating from the fuel mixture the computer commands for the rest of the engine. The module monitors crankshaft speed fluctuations and oxygen sensor feedback to flag this cylinder as contributing an unequal share of power or emissions.

DTC codes / P21xx · Fuel and air metering / P21A6

P21A6Cylinder 11 Air-Fuel Ratio Imbalance

P21A6 indicates that the powertrain control module has detected an air-fuel ratio imbalance on cylinder 11, meaning that cylinder's combustion is deviating from the fuel mixture the computer commands for the rest of the engine. The module monitors crankshaft speed fluctuations and oxygen sensor feedback to flag this cylinder as contributing an unequal share of power or emissions.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyProfessional

AreaFuel and air metering

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