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DTC codes / P21xx · Fuel and air metering / P21E1
P21E1 indicates that the engine control module has detected an abnormally high voltage on the control circuit for cylinder 3 injector B, which usually points to an open circuit or a short to power rather than a faulty injector itself. The computer monitors the injector driver circuit and sets this code when the voltage exceeds the expected range for the commanded injector pulse.
Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.
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