4240 SPN Fault Code

Name:

Engine Exhaust Bank 1 O2 Sensor Closed Loop Operation

Description:

This parameter indicates the status of the bank 1 O2 sensor feedback closed loop operation 0000b = Open loop – has not yet satisfied conditions to go closed loop 0001b = Closed loop – using oxygen sensor(s) as feedback for fuel control 0010b = Open loop due to driving conditions (e.g., power enrichment, deceleration enleanment) 0011b = Open loop – due to detected system fault 0100b = Closed loop, but fault with at least one oxygen sensor – may be using single oxygen sensor for fuel control 0101b to 1110b = reserved 1111b = not supported See also SPN 1696 as an prior implementation.

4240 spn fault code name is Engine Exhaust Bank 1 O2 Sensor Closed Loop Operation. If you don't take the time to look into 4240 spn fault when it arises, it can add up quickly. One small issue like 4240 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 4240 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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