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Misfire and/or Check Engine Light Due to Failed Ignition Coil on Lexus RX300

Problem Description and Possible Solution

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.

Problem Data
RepairPal Verified
Average mileage: 143,987 (60,000–235,000)
5 model years affected: 1999, 2000, 2001, 2002, more2003
24 people reported this problem
Viewing 1 - 12 of 12 comments
I had 3 coils fail within 9 months. At the point of the 3rd failure, I replaced all remaining coils. The front 3 are child's 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 access. It can be done though, and without removing any other engine/intake parts. If this happens to you I recommend replacing all the coils, I never had a problem after that.
Need to replace 3 ignition coils. Check engine light was flashing and car was shaking in hood area
Misfire and CEL came on and blinking. Coil was bad. Replaced with aftermarket. Month later another coil goes bad. First one was original Denso. Second was a replacement, Same brand I used on the first. Crap! Next one goes out I'm getting new OEM Denso brand from online and replacing all 6. Returning other brand under 1-year warranty.
Coil 4, 5 went out within one week...Replaced all 6..
replace coils every 5 months went in this time said two coils out and one valve is shot. basically im junking it. valve job is like 4000 and then what next the engine, Forget it. 3.0 motor sucks.
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.
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.
One day last week as I'm driving the check engine light comes on, then starts blinking. A few moments later- it starts sputtering. It felt like someone quickly tapping the brakes as I'm driving. Drove to several diagnostic shops that day AND the next. Spent a total of 9-10 hours waiting around and most people were honestly, clueless. However most did mention spark plugs. Replaced those and still, no difference, same symptoms. Other possibilities listed were bad computer, bad wiring, fuel injectors, fuel pump, fuel filter, or all 6 bad coils. In this list, most seem to agree that it couldn't be all 6 coils, so it was probably the computer at this point. Finally, the last and most expensive place I tried was the closest Toyota dealership. So after 5 days of a courtesy car rental from Toyota and their $115 diagnostic fee, it was the #3 ignition coil that was bad, and the reason all of them were showing misfires was because all 6 share the same circuit. Purchased a coil from Auto Zone, drove the vehicle to the next parking lot and was changed in 5 minutes (+20 to disconnect the battery terminal and let rest). Reconnected the battery and no check engine light! Drove all day no more problems. So glad it was just a coil and NOT the ECU (computer). FYI for those on a budget: The cheapest price I could find for new coils is a 6 pack listed on EBay for under $60 and free next day shipping. They're not the original Denso brand, but a quick fix. Keeping these in the vehicle for next time one of them goes bad.
1999 Lexus 300 Rx- Had the same problem with misfires. Very sporadic at first and was unsure exactly what the problem was. On my home from work one day in 100 degree weather vehicle could barely make it it was so herky jerky. Pulled over called tow truck ... Waited over an hour. Mechanic replaced all coils, tuneup and tow...$731.00!!!!!!! Next time I will take it in immediately!
Mid Firing Cylinder 1 and 2. Sluggish idling and check engine light on. Ignition coil replaced for 261.00.
Bought this 1999 Lexus 300 rx used with 30,000 miles on it. 2 ignition coils went out at 35,000 and now at 60,000 2 more have gone out. Not sure why we keep having to replace ignition coils every year but so far this hasn't been a good buy.
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.