P0151 is the OBD-II generic code indicating the O2 sensor for bank 2 sensor 1 fails to increase the voltage output above . 21 volts, indicating excessive oxygen in the exhaust.
What would cause a P0151 code?
Diagnostic trouble code (DTC) P0151 stands for “O2 Sensor Circuit Low Voltage (Bank 2, Sensor 1). It means that the oxygen sensor’s voltage has remained lower than factory specifications for a certain amount of time. P0151 code warns about a fault with the upstream oxygen sensor on Bank 2.
How do you fix a low voltage O2 sensor?
Repair any exhaust leaks before the sensor to prevent excess oxygen getting into the exhaust stream causing the low voltage readings. Check the O2 sensor for oil or coolant contaminants that could foul the sensor. Repair any harness that is damaged properly to prevent erratic readings from the sensors.
What causes O2 sensor High voltage?
The high voltage condition from the O2 sensor is indicating a lack of oxygen in the exhaust or other related problems, such as a leaking fuel injector or a broken up catalyst inside.
What causes low voltage on oxygen sensor?
A low voltage signal from the oxygen sensor indicates low oxygen content in the exhaust—a sign that the engine runs rich. The PCM responds by reducing the fuel going to the engine.
How do I fix code P0151?
What repairs can fix the P0151 code?
- Replacing the O2 sensor for bank 2 sensor 1 if all tests indicate a failed sensor.
- Repairing or replacing the wiring or connection to the O2 sensor for bank 2 sensor 1.
- Repairing exhaust leaks before the sensor that introduce excessive oxygen into the exhaust.
How do you check an O2 sensor?
How to test an Oxygen Sensor with a Clamp-meter
- Make sure the engine exhaust system is cold.
- Switch the clamp-meter on, to ‘DC current/DC amperage’ mode.
- Put the clamp around either of the oxygen sensor heater power wires (but not both). …
- Turn the engine on.
- Observe the reading, which should be between 0.25A and 1.5A.
How do you fix a high voltage O2 sensor?
Zitat von Youtube: Make sure the new injector has new seals. And never use the old seals. Over when you change the fuel injectors. Change them all as a set otherwise the engine will run unevenly.
Can a vacuum leak cause O2 sensor code?
The real problem may not be a bad O2 sensor, but possibly be an engine vacuum leak, low fuel pressure or dirty fuel injectors that are causing the engine run lean. An engine misfire, leaky exhaust valve or a leak in the exhaust manifold gasket that allows air into the exhaust may also cause this type of code to be set.