{"id":75604,"date":"2022-10-16T15:56:07","date_gmt":"2022-10-16T22:56:07","guid":{"rendered":"https:\/\/blogv2prod.wpenginepowered.com\/blog\/?p=75604"},"modified":"2026-01-13T20:45:13","modified_gmt":"2026-01-14T04:45:13","slug":"p2202-code-nox-sensor-circuit-low-bank-1","status":"publish","type":"post","link":"https:\/\/www.carparts.com\/blog\/p2202-code-nox-sensor-circuit-low-bank-1\/","title":{"rendered":"P2202 Code Explained: NOx Sensor Circuit Low (Bank 1) Causes, Symptoms, and Fixes"},"content":{"rendered":"\nReading Time: <\/span> 3<\/span> minutes<\/span><\/span>\n\n\n

The nitrogen oxide (NOx) sensor<\/a> is used by the powertrain control module<\/a> (PCM) to monitor the performance of the reductant system, making sure that NOx emissions are being controlled effectively. If the PCM is unable to detect a signal from the NOx sensor, a P2202 trouble code will be logged by on-board diagnostics (OBD).<\/p>\n\n\n\n

What Does the P2202 Code Mean?<\/h2>\n\n\n\n

Diagnostic trouble code<\/a> (DTC) P2202 stands for “NOx Sensor Circuit Low Bank 1.”<\/p>\n\n\n\n

Diesel engines require high combustion temperatures to effectively burn fuel, which means they tend to emit a large amount of NOx. To counter the effects of harmful emissions, diesel engines are equipped with an exhaust gas recirculation (EGR) system.<\/p>\n\n\n\n

The EGR system reroutes a certain amount of exhaust gas to the combustion chamber, cooling the combustion flame and preventing NOx formation.<\/p>\n\n\n\n

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Diesel engines also have diesel exhaust fluid (DEF) that’s injected into the exhaust stream before the selective reduction catalyst, converting emissions into harmless gases.<\/figcaption><\/figure>\n\n\n\n

Diesel engines also have diesel exhaust fluid<\/a> (DEF) that’s injected into the exhaust stream before the selective reduction catalyst, converting emissions into harmless gases. During this process, NOx is broken down into nitrogen, carbon dioxide, and water.<\/p>\n\n\n\n

NOx sensors are typically placed at the inlet and outlet sides of the selective oxidation catalyst. The sensors measure the amount of NOx in the exhaust after passing through the emissions equipment.<\/p>\n\n\n\n

Note:<\/em><\/strong> The definition of code P2202 might be different depending on the vehicle manufacturer. Consult the appropriate repair manual or repair database for the exact code definition.<\/em><\/p>\n\n\n\n

What are the Common Causes of the P2202 Code?<\/h2>\n\n\n\n