P0151 Code - O2 Sensor Circuit Low Voltage Bank 2 Sensor 1

What Does P0151 Mean?

The purpose of code P0151 is to track the amount of time that the Oxygen Sensor or Air Fuel Ratio Sensor takes to go from indicating that the fuel control system is in open loop to rapidly switching above and below the 450-millivolt set point, thus indicating that the fuel control system is in closed loop. P0151 is set when there is a sustained low voltage signal from the Oxygen Sensor for a specified amount of time.

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What are the common causes of P0151 ?

Possible causes include a faulty oxygen sensor, faulty electrical connector at the oxygen sensor, faulty or shorted wiring in the oxygen sensor circuit, a blown fuse for the oxygen sensor (if applicable), low or excessive fuel pressure, a vacuum leak on the engine, excessive exhaust leaks, or a faulty PCM. PCM failure is rare.

What are the symptoms of P0151 ?

These could include a lean or rich condition in the engine, decreased fuel efficiency, black smoke from the tailpipe, and an illuminated service engine soon lamp.

How do you troubleshoot P0151 ?

Replace the oxygen sensor that is downstream from the catalytic converter on the side of the engine that does not contain cylinder #1. Also, if a oxygen sensor code stating "heater circuit malfunction" the sensor has most probably failed. Look for missing ground strap or a rusty ground where the fuel tank is grounded to the frame. Check for damage to the wiring harness connector. Check to make sure they are not burnt or corroded. If in doubt, get some Electrical Contact cleaner at any parts store if cleaning of the terminals is needed.



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