Volvo Penta 380 CD Gas, 2015, SPN 4237 code, Regal 28 Express

by Joe
(Cincinnati Oh / Islamarada Fl)

We’re getting a ltft 1 spn 4237 fault code, have replaced 1 of the pre catalyst O2 probes and both of the post catalyst probes as they were in bad shape. Still getting the code.

Replaced the fuel pump this past summer along with the fuel filter.
Replacing the 2nd post catalyst O2 next time we get to the boat.
Has anyone had this code? If so what was your fix?
Looks like the next step is injector checking/replacement.

Thank you!

Joe

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