I had to have the the fuel tank in my '05 STS replaced, the fuel gauage repaired, and replaced the main module that controls the memory. I was informed after purchase that the DRL will not function if you opt to engage the auto rain sensing wipers even if the manual indicates that you can.
Remote entry, automatic door locks, and the push button start.
Fix the gas gauge, improve the gas mileage and increase the font on the time and date in the dash.
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