i got the following codes on my nissan sentra 2001 gxe P0105, po171,po174

Question

I got the following codes. Sometimes, my transmission doesn't shift until i turn the motor off and restart, then it runs fine. Whats wrong

Answer 1

The codes you have listed indicate an issue with the mass air flow sensor. This may affect the way the transmission shifts because the car has a lean condition. Typically though, with the shifting issue you need to scan the TCM for codes. This requires a scan tool that can communiucate with the TCM, most code readers can't do this.