![]() This can help to narrow down the cause of the fault code, the injector, circuit or DME injector driver. When diagnosing Piezo fuel injector fault codes it is a good idea to begin by checking fuel injector voltage and current using a scope. However there are situations where the fault codes will set intermittently. Most times these fault codes will be permanent and will not clear. These fault codes set when fuel injectors on bank 1 or bank 2 develop circuit faults or an injector MOSFET driver fails. ![]() This article and video shows you how to diagnose these fault codes and test the signal from the DME to the fuel injectors. ![]() ![]() The check engine light will be ON with the related Fault Codes error messages. This will cause an injector to stop delivering fuel and an engine misfire to occur.
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