P0138 CHEVROLET code

What the P0138 code means. P0138 is the OBD-II generic code indicating the O2 sensor for bank 1 sensor 2 fails to have a lower voltage output below 1.2 volts for more than 10 seconds indicating a lack of oxygen in the exhaust stream.

Can you drive with P0138 code?

Is Code P0138 Serious? Driving short distances is not a problem when your vehicle shows a P0138 code. However, you shouldn’t let it go long without examining the underlying cause of the code in the first place. Running the engine with a higher fuel-to-oxygen ratio does not cause immediate damage to your vehicle.

What can cause a P0138 code?

P0138 Causes

  • Faulty O2 Sensor.
  • Short to battery voltage in O2 sensor signal circuit.
  • Corroded wiring.
  • Fuel pressure too high.
  • Engine coolant temperature sensor.

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.

Is P0138 code upstream or downstream?

Code P0138 is set when the downstream sensor sends too high of a voltage signal for an extended period of time. Too high typically means higher than 1.1 volts, which is very high for a traditional zirconia style sensor.

Can a bad catalytic converter cause a P0138?

While it’s common for the HO2S to wear out over time, there are a number of other issues that trigger a P0138 diagnostic code and have nothing to do with the oxygen sensor. These include: An inefficient catalytic converter. Engine vacuum leaks that create a lean exhaust condition.

Can an exhaust leak cause a P0138 code?

An exhaust leak can also cause this code to appear, but if you have replaced the exhaust system, then that is ruled out. If you need further assistance with your check engine light being on, then seek out a professional, such as one from Your Mechanic, to help you.

How do I fix error P0138?

What repairs can fix the P0138 code?

  1. Replacing the O2 sensor for bank 1 sensor 2.
  2. Repairing or replacing the wiring or connection to the O2 sensor for bank 1 sensor 2.
  3. Replacing the catalyst in front of the sensor.
  4. Repairing a leaking injector.

What causes an oxygen sensor to have high voltage?

Code P0132 is triggered when the PCM detects that your heated oxygen sensor reading is too high. This happens when the oxygen sensor voltage stays above a certain threshold for a select amount of time. The code is also triggered if the air-fuel ratio stayed in a rich-biased condition for too long.