ISP0138 - O2 Sensor Circuit High Voltage Bank 1 Sensor

Question

Recently replaced the catalytic converter.

Answer 1

Hi there,

This code could have several reasons for happening. Since you just had the converter replaced I would start by checking the connector and making sure it's not corroded or damaged. The code happens when you get to much voltage reported by the sensor to the computer. A short to power could also cause this type of code. It's possible the sensor itself was damaged inside as well during the switch over on the converter.