NOx Sensor Supply Voltage Circuit Bank 1 Sensor 1
Table of contents
P220A MERCEDES-BENZ Possible Causes
- Faulty NOx Sensor
- NOx Sensor harness is open or shorted
- NOx Sensor circuit poor electrical connection
- Faulty Engine Control Module (ECM)
How do I fix code P220A MERCEDES-BENZ?
Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector’s pins.
Cost of diagnosing the P220A MERCEDES-BENZ code
The cost of diagnosing the P220A MERCEDES-BENZ code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle’s make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.
Possible Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
P220A MERCEDES-BENZ Description
This fault code is stored when a malfunction is detected with the NOx Sensor circuit. Some lean burn and direct injection vehicles will use a Selective Catalytic Reduction System (SCR), which uses a NOx accumulator to store oxides of Nitrogen and allows them to be reduced at a suitable time. A NOx sensor is used to detect when a regeneration is required and when the regeneration is complete. The NOx sensor will have a module located close to the sensor which communicates with the engine control module. A heater circuit is required to get the NOx sensor up to operating temperature quickly to allow for reliable performance in a timely manner.