HI. I just got my engine back together, new timing chain and gears, and new heads. It had a head gasket leak. Now it runs great, way more power than it is has since I have owned it. After driving it a couple of miles today the check engine light came on and I pulled the codes. I got 118, 157, and 176. Engine coolant temp sensor above max voltage, mass air flow sensor fault, low voltage, and HEGO sensor fault/always lean. Can the mass air flow sensor cause these other codes, or is there something I should be looking for. The oxygen sensors were both replaced about 2 years ago. The truck seems to be running fine. Thanks for any help.

 

I cleaned the MAF sensor and cleared the codes then ran it again and now only the 176 code for the O2 sensor is coming up. I wouldn't think the sensor is bad, it is only a few years old and was fine before I did all the work to it.

 

if the coolant was leaking for a while it will damage the o2 sensors fast
I would swap the sensor out

 

It was losing a good bit of fluid before the head gasket replacement. I will try swapping the two sensors and see if the code is still there. I didn't think about water getting on it. Thanks for the advice.