2004 GMC Sierra 5.7L with code P0141, already changed 02 sensor, what else could it be?

Question

2004 GMC Sierra 5.7L with code P0141, we have already changed 02 sensor, what else could it be?

Answer 1

Hi there

if replacing the sensor doesn't solve the issue, then it's usually a wiring issue. Start by checking the fuses for the O2 sensors. Since this is an issue with the heater circuit, all the wiring should be checked as well.

P0141 GMC - O2 Sensor Heater Circuit Malfunction Bank 1 Sensor 2

Read more: https://www.autocodes.com/p0141_gmc.html