What does this code mean?
The wording below belongs to the named make and communication. Match the complete code, reporting module, model year and engine before applying it.
A code identifies a detected condition, not a part that must automatically be replaced.
Manufacturer wording
Source wording can vary by vehicle and suffix. It is shown as written, not as a universal diagnosis.
P21A1-00Cylinder 6 Air-fuel Ratio ImbalanceP21A100Cylinder #6 Air-Fuel Ratio Imbalance If one or more of the listedManufacturer communications
5Original wording in English
RAM
Reported code forms P21A1-00
Loose Charge Air Cooler Case Crimp Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle must exhibit/set one or more of the following Diagnostic Trouble Codes (DTCs): ● P219C-00 -…
KIA
Reported code forms P21A100
TECHNICAL SERVICE BULLETIN: CYLINDER IMBALANCE DTC P219XXOO INSPECTION AND INJECTOR REPLACEMENT - This bulletin has been revised to include additional information. New/revised sections of this bulletin are indicated by…
KIA
Reported code forms P21A100
TECHNICAL SERVICE BULLETIN: CYLINDER IMBALANCE DTC P219XXOO INSPECTION AND INJECTOR REPLACEMENT - This bulletin provides information regarding cylinder air-fuel ratio imbalance DTC P219XX00 stored in ECU on some 2022MY…
AUDI
Reported code forms P21A100
MIL is on due to One of the following DTCs for air-fuel ratio imbalance is stored in the engine control module (ECM), J623 (address word 01): DTC P219C00 (stored in cylinder 1), DTC P219D00 (stored in cylinder 2), DTC…
TOYOTA
Reported code forms P21A1
TSB: Some 2015 model year Tacoma vehicles equipped with a 1GR-FE engine may exhibit a MIL ?ON? condition with Diagnostic Trouble Codes (DTCs) P219A, P219B, P219C, P219D, P219E, P219F, P21A0, and/or P21A1 present. Follow…
Check vehicle applicability
11A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
Before replacing a part
Record codes and freeze-frame data. Check battery condition, related codes and visible wiring or hose damage. Follow the vehicle's diagnostic procedure and test results before replacing parts.
Can I keep driving?
A code alone cannot establish whether driving is safe. A flashing malfunction light, severe shaking, overheating, oil-pressure warning or loss of braking or steering needs prompt attention. Stop in a safe place and seek assistance when control or engine safety is affected. Follow the vehicle handbook.