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Hi everyone, I’m driving a 2017 RX350 with 125K miles and recently started experiencing jerky acceleration around 25–30 mph and again at 45–60 mph, along with occasional RPM dips at idle when stopped. After longer drives, I sometimes hear ticking sounds from the engine bay with the engine running. There’s no check engine light, but a Lexus dealer quoted me $547 to replace one ignition coil, and an independent shop in Chicago quoted $1,900 to replace all six, citing the need to lift the intake manifold for the rear bank.
I’m wondering if anyone else—especially RX350 owners in the Chicago area—has had similar symptoms without a CEL. If so, was it coil-related or something else (one of my friends mentioned "timing belt" but I understand that 2017 Rx350 does not have a timing belt but a chain)? Also, what did you pay for coil replacement, and do you have any shop recommendations locally? I’d really appreciate any insight—just trying to get this sorted without jumping into unnecessary repairs. Thanks!
It is possible to have codes with out having a check engine light. You can buy a cheap aftermarket "Dongle" to plug into the OBD test port that will bluetooth to your phone. Download one of the OBD2 apps and, depending on what level of dongle you buy you can do everything from only checking codes to seeing datastream and more. Handy to have and could potentially save you a trip to a mechanic.
Did you get a diagnosis from the lexus dealer who quoted you on the coil?
Faulty coil that causes issues you can feel, should set cel.
But you can go to an autozone oreillys etc and have them check your codes.
This will indicate if you have a bad coil and which one.
If it's a front one you can change it in literally 2 minutes with only a 10mm socket.
The rears do require removing the intake but it's a simple job. $1900 is nuts. Only replace the bad one,
the others may last the life of the car. These coils rarely fail. I did all 6 plugs taking my time hour and a half.
"Customer states: When driving between 30–60 MPH, the vehicle feels very shaky during acceleration only. No warning lights on the dash.Cause: Test drove the vehicle and found it driving normally at the moment. Scanned the vehicle and found in freeze frame data that Cylinder 2 has a misfire, which can cause shaking. Recommend replacing coil #2."
Here’s a link to the sound the vehicle makes after driving for at least 20 minutes. There are no unusual noises during a cold start. Please disregard the rather obvious background hum from the parking garage. The ‘tic tic’ sound increases in speed when I press the accelerator.
Remove engine cover, remove 10mm bolt, undo coil connector plug.
Undo the connector to the right of it too, so you can move the wire so you can pull coil #2 out of engine. Reverse to install. That's it.
Pics came from this video which involves a lot more than you need to do, but refer to it for visual if you need to -
#2 is very easy to do. its the far left on the front back. Denso coil on rock auto is $55 and you would only need a 10mm socket.
curious why they recommended the coil without starting with plugs. have you changed the spark plugs before? that would be the first step.
#2 is very easy to do. its the far left on the front back. Denso coil on rock auto is $55 and you would only need a 10mm socket.
curious why they recommended the coil without starting with plugs. have you changed the spark plugs before? that would be the first step.
On my 14 Venza 2GR V6, the my supplied six Denso spark plugs were replaced at the Toyota dealer for $350.
Going beyond 60k mi on a set of 2GR-FKS plugs could lead to premature coil failure since the gap is too large and the coil over compensates. Ask them to measure the plug #2 gap. The Lexus RX350 specs is 60K.
Any oil consumption between oil changes?
At 120K, u should be on ur 3rd set of plugs since this is a D4S system.
Last edited by monju0525; Jul 19, 2025 at 08:16 AM.
Iridium plugs can easily go over 100k and COP and easily throw spark across a .050 gap. 60k is way too soon but its your money.
60k is what we recommend for platinum plugs. 90-120k for iridium.
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2017 RX350 Ignition Coil replacement Cost.
