P2201: NOx Sensor Circuit Low Input Bank 1

The P2201 code is an OBD-II trouble code that stands for “NOx Sensor Circuit Low Input Bank 1.” This code indicates that the powertrain control module (PCM) has detected a low input signal from the NOx sensor on bank 1. The NOx sensor is a type of emissions control device that helps to reduce the amount of nitrogen oxides (NOx) emitted from the engine.

There are a few possible causes of the P2201 code, including:

• A faulty NOx sensor
• A damaged or corroded NOx sensor wiring harness
• A loose or corroded NOx sensor connector
• A problem with the PCM

If you have the P2201 code, it is important to have your vehicle diagnosed by a qualified mechanic as soon as possible. The mechanic will be able to determine the cause of the problem and recommend the necessary repairs.

Here are some tips for preventing the P2201 code:

• Have your vehicle’s emissions system regularly inspected and maintained by a qualified mechanic.
• Avoid driving in areas with high levels of air pollution.
• Use high-quality gasoline.
• Change your engine oil and filter regularly.
• Inspect your vehicle’s exhaust system for leaks regularly.