• The fault code P0158 indicates that the oxygen sensor circuit for bank 2, sensor 2 is experiencing high voltage. This may cause poor engine performance or result in increased emissions.

Possible Symptoms:

  • Illuminated check engine light

  • Poor engine performance

  • Increased emissions

  • Reduced fuel efficiency

Possible Causes:

  • Failed oxygen sensor

  • Damaged or corroded wiring in the circuit

  • Loose or damaged electrical connections

  • Malfunctioning engine control module (ECM)

  • Exhaust leaks

Related Parts:

  • Oxygen Sensor: This is one of the parts that fails very commonly. It measures the amount of oxygen to ensure proper combustion. Problems in the Oxygen Sensor lead to poor fuel economy

Possible Solutions:

  • Replace the faulty oxygen sensor

  • Inspect and repair any damaged or corroded wiring in the circuit

  • Ensure all electrical connections are secure and in good condition

  • Replace the engine control module (ECM) if necessary

  • Check for and repair any exhaust leaks