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P2201 is a diagnostic trouble code (DTC) for "NOx Sensor Circuit Range/Performance Bank 1". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.
NOx Sensor Circuit Range/Performance Bank 1
Related Trouble Codes:
The P2201 diagnostic trouble code indicates that the nitrogen oxide (NOx) sensor circuit is out of range or has a performance issue.
The purpose of the NOx sensor is to measure the amount of nitric oxide and nitrogen oxide in the exhaust system, and when the storage capacity of these harmful gases has been reached. When the NOx sensor indicates that the storage capacity has been reached, the regeneration phase is initiated by the fueling management system.
Vehicle manufacturers predetermine the appropriate levels of NOx gases that should be present in the fuel management system. The NOx sensor monitors these levels. When the Engine Control Module (ECM) receives information from the NOx sensor that it is out of range/performance, the P2201 diagnostic trouble code will be stored, and the Check Engine Light will come on indicating that there is a problem that needs to be addressed. It is important to note that several drive cycles may be necessary before the Check Engine Light will come on.
Uses an OBD-II scanner to retrieve all of the trouble codes that have been stored by the ECM
Checks with your local dealer for any TSB’s related to this code (a lot of manufacturers have a technical service bulletin (TSB) for this trouble code; it consists of reprogramming the ECM or updating the ECM to get rid of the code)
Inspects the wiring going to the NOx sensor for shorts or opens in the wiring harness (damaged wiring should be repaired or replaced)
Inspects the connector to the NOx sensor for corrosion, damage, or bent pins
If the wiring and connector are in good condition:
Failing to inspect the wiring and connector for damage before replacing the NOx sensor
Failing to check if this code is under a TSB and allowing the dealer to make repairs if the P2201 trouble code is under warranty
The P2201 trouble code does not cause driveability problems. However, operating a vehicle while this trouble code is stored in the ECM will allow harmful gases to be emitted into the environment, and damage to other components of the engine is possible. It is important to have this trouble code diagnosed and repaired without allowing an extended period of time to pass.
It is often necessary to have this issue repaired by the dealer or by reprogramming the ECM. It is important to first check to see if the repair for this trouble code is covered by warranty before replacing any parts. Keep in mind that it is possible for this issue to be resolved by simply updating the ECM.
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