Hello all,
My mechanic installed one of these a few weeks ago, it was fine for a few days; and then symptoms returned.
I've read these might need to be calibrated properly using a scan tool at dealership, is this correct?
Also, I have one more question; can this issue be diagnosed in advance on this car with a code reader?
Thank you so much for any, and all responses in advance.
I see many of the same issues I've experienced on this vehicle over the years, and it's been a good resource.

this being a 2005 Malibu LS V6
My mechanic installed one of these a few weeks ago, it was fine for a few days; and then symptoms returned.
I've read these might need to be calibrated properly using a scan tool at dealership, is this correct?
Also, I have one more question; can this issue be diagnosed in advance on this car with a code reader?
Thank you so much for any, and all responses in advance.
I see many of the same issues I've experienced on this vehicle over the years, and it's been a good resource.
this being a 2005 Malibu LS V6