Posts Tagged: P0031 or P0037 Nissan Altima

P0031 or P0037 Nissan Altima

Fix code P0031 or P0037 Nissan Altima If you have a P0031 or P0037 code on a Nissan Altima, you’re looking at a sensor heater problem. Oxygen sensors work when they at full operating temperature. To speed up the heating process, Nissan adds a pulse modulated heater. The ECM pulses power to the heater based on engine speed. Due to low exhaust flow at low RPMs, the ECM dictates almost 100% duty cycle power to the heater. As RPMS increase and exhaust flow keeps the sensor heated, the ECM cuts … Read More