CEL After Spark Plug Change
Thread Starter
3rd Gear
Joined: Aug 2025
Posts: 3
Likes: 0
CEL After Spark Plug Change
Hello everyone, I am new here and I’ve been using this website to help me with my Lexus is350 2006 ,
So I was gone for a month. I had a buddy change my spark plugs and then when I come to turn it on, it starts to idle hard and when I put it in drive it starts to shut off slowly , but if I put it back in park it idles normal but rough , before the spark plug change the car was running super smooth before he changed them he put in Brisk ER14s, the spark plugs I ordered were Bosch iridium 9613 from autozone which I put in today and swapped them out but problems still persist , I have not changed the coil yet because I was told so spark plugs first . I did a test and get P0355
Ignition Coil "E" Primary Control Circuit/Open
+ Show details
MOST LIKELY FIX
Replace Ignition Coils) and Spark Plug(s)
Parts
Ignition Coil
Quantity: 1
Spark Plug
Quantity: 6
Stored/Confirmed
P0355
Ignition Coil "E" Primary Control Circuit/Open
P0113
Intake Air Temperature Sensor 1 Circuit High Bank 1
Any thoughts?
So I was gone for a month. I had a buddy change my spark plugs and then when I come to turn it on, it starts to idle hard and when I put it in drive it starts to shut off slowly , but if I put it back in park it idles normal but rough , before the spark plug change the car was running super smooth before he changed them he put in Brisk ER14s, the spark plugs I ordered were Bosch iridium 9613 from autozone which I put in today and swapped them out but problems still persist , I have not changed the coil yet because I was told so spark plugs first . I did a test and get P0355
Ignition Coil "E" Primary Control Circuit/Open
+ Show details
MOST LIKELY FIX
Replace Ignition Coils) and Spark Plug(s)
Parts
Ignition Coil
Quantity: 1
Spark Plug
Quantity: 6
Stored/Confirmed
P0355
Ignition Coil "E" Primary Control Circuit/Open
P0113
Intake Air Temperature Sensor 1 Circuit High Bank 1
Any thoughts?
Pole Position
Joined: Dec 2013
Posts: 3,466
Likes: 920
From: wa
Since we are talking about plugs, i’ll mention NGK’s new Ruthenium plugs have been in the GS for a decent 10k to 15k miles. Thee car runs better than any car that age and mileage has any right to. I’m sold on them for higher compression applications, at least. The performances matches the marketing promises according to my poorly calibrated dyno (my butt).
Racer
Joined: Jan 2025
Posts: 1,348
Likes: 344
Easy move the coil around and see if the code follows with.
If it does then you need a new oem or denso/ngk/ntk brand coil.
If it doesnt then you need a new oem or denso/ngk/ntk brand spark plug
Personally with electronics on cars, stick to what came equipped from the factory.
While not an exact science, most JP makers usually in house their electronics from Denso/NGK/NTK/Hitachi
If it does then you need a new oem or denso/ngk/ntk brand coil.
If it doesnt then you need a new oem or denso/ngk/ntk brand spark plug
Personally with electronics on cars, stick to what came equipped from the factory.
While not an exact science, most JP makers usually in house their electronics from Denso/NGK/NTK/Hitachi
Last edited by Framestead; Aug 4, 2025 at 03:58 AM.
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Bingo, this sounds like a broken clip/ignition wire. Whether it be a Bosch, brisk, champion, ngk etc, if the plug is sized right and the gap is close to factory spec you won't get a crazy rough idle like OP mentions. Maybe misfires at high RPM, but this motor doesn't sound like it's firing on all cylinders.
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Pole Position
Joined: Dec 2013
Posts: 3,466
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From: wa
Yes. Toyota’s “V” numbering is opposite of, say, GM. For a Toyota, if it’s transverse, the even number ones are towards teh front of the car. If it’s longitudinal, they are in front of the (US) driver.
Thread Starter
3rd Gear
Joined: Aug 2025
Posts: 3
Likes: 0
New Coils
Bingo, this sounds like a broken clip/ignition wire. Whether it be a Bosch, brisk, champion, ngk etc, if the plug is sized right and the gap is close to factory spec you won't get a crazy rough idle like OP mentions. Maybe misfires at high RPM, but this motor doesn't sound like it's firing on all cylinders.
I just replaced coils 5 and 6 all new spark plugs and I still get the P0355 , rough idle etc here’s a video , hopefully you can hear it but when I put it in drive it wants to turn off , when I put it in park I can idle as long as it wants but rough .
https://streamable.com/0wscwj
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