Ford NOx Sensor Guide: Applications and Replacement Basics

Overview
Ford NOx sensors measure nitrogen oxide emissions in the exhaust system and help vehicles maintain compliant emissions performance. They are an important part of the SCR and aftertreatment control strategy.

Function
The Ford NOx sensor measures NOx concentration in the exhaust gases and sends a signal to the engine control module (ECM), which then adjusts engine operation and aftertreatment behavior as needed.

OE number list
OE numbers vary by Ford model and engine family. Below are several common Ford NOx sensor part numbers.

• 2382101
• HC3A-5L248-CB
• JK21-5L248-AG
• JK21-5L248-AF
• JK21-5L248-AC
• LK21-5E145-AA1

It’s important to note that these OE numbers may not be applicable to all Ford vehicles, and it’s always best to consult the vehicle’s owner’s manual or a trusted mechanic to ensure that the correct part is being used.

Error code basics
If the Ford NOx sensor develops a fault, the ECM may store an error code. Below are several common fault codes related to Ford NOx sensor issues.

P2201: This code indicates that there is a problem with the NOx sensor circuit or signal.
P2202: This code indicates that the NOx sensor circuit is low.
P2203: This code indicates that the NOx sensor circuit is high.
If any of these error codes are detected, it’s important to have the vehicle inspected by a qualified mechanic to determine the root cause of the problem and make any necessary repairs.