Re: 09 Mercury Mariner Tire Pressure Sensor Fault
what is the brand of the remote start? does it do some kind of rolling code/rolling frequency? I am wondering if it is causing RF interference. The TPMS and your keyless entry are probably operating on similar frequencies and if the remote-start has variable codes or frequencies it might have rolled into a region that is messing up the others, this could explain why it worked for a while.
The dealer might need to force-re-train your TPMS and/or the convenience computer.
Find out the brand and I will try to google for info.
The gas-pedal vibration is normal, it should only happen once though (first time you hit 45).
If it was dealer-installed you should not have to monkey with ANYTHING.