I have an '01 SE7 and I got my codes read by the dealer. I have one code I wasn't sure about, P0734, gear ratio incorrect? Should I be concerned about this? They did replace the transfer case right before I bought it. I have slightly larger tires than stock, 245-70-16 but I wouldn't think this was it.

I also had codes P0154 and P0134. They replaced both front O2 sensors and the Mass Airflow sensor under my short term warranty. I assume this should take care of those.

Thanks

 

Check your tire pressure. I have heard of the wrong PSI setting of codes but cant confirm. The fronts and backs are supposed to be at different PSI.
What does the dealer say about the code?
Go to AutoZone and have the codes cleared and see if it comes back on.

 

I used to have the PO734 code come on every few weeks or so. One indication is supposed to be a failing MAF sensor. I just erased it and it stayed off for a few weeks. My battery was reading a bit low so I gave it a good long charge and it hasn't come on since. This was a month or so ago, so we'll see if it stays off.

 

The 734 code is usually caused by a bad MAF, the other two codes are related to both of your front 02 sensors.
How many miles on the truck?

Are you sure they replaced the MAF and the 2 front 02's????????????????????

 

OK, this makes sense. These were the codes from before they did the work, the check engine light is off now so I assume all is well.
They replaced the front sensors, should I replace the rears? It runs fine now.

Thanks

 

I forgot to mention it has 94kmi.

 

With that mileage replace them all.

 

I agrtee, replace them all using the same brand.