While this code is often confused with more common O2 sensor codes like or P015B (which deal with the oxygen sensor heater circuit or delayed response times ), the P155B-00 designation is specifically tied to turbocharger management in modern Nissan diesel or turbo-gasoline engines. Meaning of P155B-00
: Check the negative battery terminal for loose connections or corrosion on the sensor and its harness. Battery Test nissan p155b-00