P0150 O2 Sensor Circuit Malfunction Bank 2 Sensor 1
Description and meaning of DTC p0150
This diagnostic trouble code (DTC) is a generic powertrain code, which means that it applies to OBD-II equipped vehicles. Although generic, the specific repair steps may vary depending on make/model. The O2 sensor produces a voltage based on oxygen content in the exhaust. Thevoltage varies between . 1 and . 9 Volts, . 1 indicating lean and . 9 indicatingrich. Sensor #1 is the first sensor downstream fromt he engine. The ECM constantly monitors this voltage while in closed loop to determinehow much fuel to inject. If the ECM determines that the O2 sensor voltage wastoo low (less than . 4 Volts) for too long (for more than 20 seconds (time varieswith model)), this code is set. The code P0150 refers to Bank2.
p0150 diagnostic trouble code symptoms
Depending if the problem is intermittent or not, there may be no symptoms otherthan MIL (malfunction indicator lamp) illumination. If the problem is constant,then symptoms may include one or more of the following:MIL illuminationEngine runs rough, missing or stumblingBlows black smoke from tail pipeEngine dies Poor fuel economy
DTC p0150 - possible causes
Usually the cause of P0150 is a bad oxygen sensor, however this isn't alwaysthe case. If your o2 sensors haven't been replaced and they are old, it's agood bet that the sensor is the problem. But, It could be caused by any of thefollowing: Water or corrosion in the connectorLoose terminals in the connectorWiring burnt on exhaust components Open or short in the wiring due to rubbing on engine components Holes in exhaust allowing unmetered oxygen into exhaust system Unmetered vacuum leak at the engine Bad o2 sensor Bad PCM
How to fix OBD-II diagnostic trouble code p0150
Using a scan tool, determine if the Bank2, sensor 1 is switching properly. It should switch rapidly between richand lean, evenly. 1. If it does, the problem is likely intermittent and you should examine thewiring for any visible damage. Then perform a wiggle test by manipulating theconnector and wiring while watching the o2 sensor voltage. If it drops out,fix the appropriate part of the wiring harness where problem resides. 2. If it doesn\'t switch properly, try to determine if the sensor is accuratelyreading the exhaust or not. Do this by removing the fuel pressure regulatorvacuum supply briefly. The o2 sensor reading should go rich, reacting to theextra fuel added. Reinstall regulator supply. Then induce a lean condition byremoving a vacuum supply line from the intake manifold. The o2 sensor readingshould go lean, reacting to the enleaned exhaust. If the sensor operates properly,then the sensor may be okay and the problem may be holes in the exhaust or anunmetered vacuum leak in the engine (NOTE: Unmetered vacuum leaks at the engineare almost always accompanied by lean codes. Refer to the appropriate articlesfor diagnosing an unmetered vacuum leak). If the exhaust does have holes init, it's possible that the o2 sensor may be misreading the exhaust because ofthe extra oxygen entering the pipe via those holes3. If none of this is the case and the o2 sensor just isn't switching or actssluggish, unplug the sensor and make sure there is 5 Volt reference voltageto the sensor. Then check for 12V supply to the o2 sensor's heater circuit. Also check for continuity to ground on the ground circuit. If any of these aremissing, or aren't their proper voltage, repair open or short in the appropriatewire. The o2 sensor will not operate properly without proper voltage. If theproper voltages are present, replace the o2 sensor.