On higher mileage vehicles, an engine misfire may develop and/or the Check Engine Light may illuminate due to a failed ignition coil. It is not uncommon to replace all the coils when the first one fails in order to prevent return trips to the repair shop.
Car Problem Reports
Lexus RX300 Ignition Coil May Fail After 100,000 Miles
Lexus RX300 Problem
Average Mileage: 111,062 mi (85,000 mi - 154,250 mi)
I had 3 coils fail withing 9 months. At the point of the 3rd failure,I replaced all remaining coils. The front 3 are child play to do yourself, a chimp with a screwdriver could do it. The rear 3, you'll wish you were a chimp due to the limited success. It can be done though, and without removing any other engine/intake parts.
Visitor, 2000 Lexus RX300, 154,250 mi
Driving down the freeway and engine got loud (sounded like a putt-putt car), check engine light started flashing. Engine still had power so I kept driving. Shop found 3 cylinders were missing timing, replaced one bad ignition coil - cost $370.
Visitor, 1999 Lexus RX300, 85,000 mi
Car felt odd then the coil went out and couldn't even start the car. After getting it fixed, everything was right and felt normal.
Visitor, 2000 Lexus RX300
Check engine light came on and went off 3-4 times. Diagnostic check found coil pack needed to be replaced. No problem since coil pack was replaced.