How much should it cost to have a spark plug coil replaced on a 2007 ES350 in Denver? Computer says "F" is bad--which one is that?

 

 

F is cylinder #6. That's low right corner as you face the engine. I've replaced 2, 4, & 6. #2 got replaced with a lifetime guaranteed coil from Autozone for $70, at about 180K. Then #6 went bad at about 207K. I replaced that one and #2 with coils from Amazon for $18 each. They now run $23, or all six for $80. See AA Ignition #9091902251. Car has not had any issues with these aftermarket coils. Coils are, otherwise, very easy to replace; you don't need to unplug the car battery - just remove the connector and the 10mm bolt and pull up. Be glad the bad coil was not one of the ones next to the firewall. If you have more than 150K , at your next spark plug replacement, I would seriously consider replacing the rear three plugs, then save them for replacing the front ones if any of them go bad.