P2211 - NOX SENSOR HEATER SENSE CIRCUIT HIGH BANK 1

The Oxides of Nitrogen (NOx) sensor is a high-temperature device, mainly used in diesel engines. Its function is to detect levels of nitrogen oxides in the vehicle after they exit the exhaust. The Engine Control Module (ECM) continuous high-temperatures monitors the work of the NOx Sensors in order to ensure acceptable levels of emissions in the car’s exhaust. If these emissions are not regulated, damage to the atmosphere can occur, such as smog or acid rain.

The ECM calculates nitric oxide and nitrogen dioxide gases, based on the information provided by the Oxygen (O2) and Oxides of Nitrogen sensors (NOx). In this way, the ECM can make the necessary adjustments and regulations in order to take care of the environment.

When the DTC P2211 OBDII code is set, it is because the vehicle’s computer found that the NOx Sensor circuit reading levels are higher than the allowable levels.

• Check Engine light illuminated.
• Unable to start the engine, when the engine is hot.
• Reduced engine performance.
• Stuttering during acceleration.

The reasons for the P2211 OBD2 error code being stored are:

• Maybe the Catalytic Converter is malfunctioning.
• Perhaps there is an incorrect fuel mixture.
• The Coolant Temperature Sensor (ECT) may be faulty.
• Possibly the Manifold Absolute Pressure (MAP) sensor is bad.
• The fuel pressure regulator may be defective.
• There may be exhaust leaks.
• There could be a bad O2 Sensor.

Troubleshooting steps for the P2211 OBDII fault code should take into account the following:

• As a first step, it is recommended to consult the Technical Service Bulletins.
• Check the exhaust for soot residues. The presence of black soot near the system connections indicates leaks. Make any necessary repairs.
• Use an infrared temperature gun to check the exhaust temperature. The results you obtain should be compared with the manufacturer's specifications. If all values are in compliance, check the circuit wiring. Repair it as necessary.