Software tracking errors within the Nissan control module that require a dealership flash update. Step-by-Step Diagnostic Guide
: In models equipped with Auto Start-Stop, the system will often disable itself to protect the battery. Diagnostic and Repair Steps
typically refers to a communication or voltage issue within the Grille Shutter
Pop the hood and inspect the negative battery terminal where the small sensor module is mounted.
A: At minimum, an OBD‑II code reader, a digital multimeter, and access to a wiring diagram for your specific Nissan model. For thorough testing, a battery load tester and an alternator tester are also recommended.
While "P155" codes are often mistaken for standard O2 sensor codes (like P0155), the full 7-character manufacturer-specific code points toward the active aero components. Understanding the Grille Shutter System The Component