Code P0102 shows on reader, upon cold starts runs very rough until fully warmed up

Question

p0300 also showed.  Should I change O2 sensor or MAF sensor How do I know which one is the problem.  I have a digital voltmeter, would that help?
Thanks!

Answer 1

Hi there,

I would replace the maf sensor. The code is pointing to the maf and not the O2 sensor. You can take the meter and make sure you have power and ground to the sensor, but with the code pointing at it, it's a safe bet it's no good.