4090 SPN Fault Code

Name:

NOx limits exceeded, root cause unknown

Description:

Indicates that On-Board Diagnostics has determined that the limits for NOx in the exhaust stream have been exceeded, but the root cause cannot be determined by the OBD system.

4090 spn fault code name is NOx limits exceeded, root cause unknown. If you don't take the time to look into 4090 spn fault when it arises, it can add up quickly. One small issue like 4090 can cause a larger component to become damaged without taking the time to investigate. If you suspect your truck is suffering from one of these issues, look into replacing those small components to save money down the road.

Note: The name and description of 4090 code represents text descriptions for faults supported by another coding system and does not necessarily comply with SAE J1939. For a specific engine manufacturer's explanation for codes, please consult the engine's technical manual. See also other spn codes.

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SPNFMI Faults and Engine error code check tool. SPN code listing with names and descriptions.

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