Socal2

VSC and Check Engine light came on this morning when I started my ES350. So I checked the gas cap and it was opened, so most likely I didn't tightened it well after putting in the gas yesterday.

After I tightened the gas cap and started the car again, both lights are still on. I drove around the neighborhood and the car feels normal (no vibration) to me, but the lights remained on. Do I need to drive the car a few rounds to reset the light? But I also worry about something else aside from the gas cap is wrong. Any suggestion?

flowrider

iTrader: (9)

See this thread:

https://www.clublexus.com/forums/is-...-question.html

Lou

Shahanf

its usually the gas cap or the oxygen sensor or maybe even fuel sensor. Replace the gas cap first and unplug your battery. this will reset all warnings (can take up to 1.5 tanks for any engine light to re-trigger)

jagtoes

A simple suggestion here is for anyone to go out and buy a code scanner. You can get one for $30-$60 and make sure it has an "erase" function. When you get a CEL just plug in the scanner under the dash at the OBDII connector and read the code. Write it down and then erase it. If it comes back see the dealer or a repair shop.

farhanchy

I did the same after replacing the gas cap did not remove the cel and vsc lights. Auto zone discovered error codes of p0354, p0300-p0306 and c1201 but my car does not ave any vibration, misfiring, or any performance issues. drives smootly

igzy

Typically those are misfire codes, indicating an ignition coil issue. P0354 is cyl #4 coil, front of the car middle cylinder. I would swap the coils, e.g. #4 with cyl #2 (left) and see if the codes follow it. If they do, just replace the coil and call it a day The other cause could be a plug, wiring, or injector, but less likely. C1201 is general engine control code which could have been set by the misfire (coil)...

farhanchy

Thanks for your reply. It was a misfire . I was advised by the mechanic that I only need to change the one that gone bad and dont need to change the whole six but i am changing the 6 new plugs and one ignition coil.

jagtoes

Just a suggestion but if you are changing the 6 plugs you should change all of the coils too. Considering the amount of work to change the firewall side plugs it would be a easy change. Usually when one coil goes you will start to see more follow.

farhanchy

I asked the mechanic he told me lexus coils dont often go bad, changing 6 together is very expensive . I had a quote from Midas and they wanted to charge me $250 per coil total of $2500 whereas normally a coil costs $70 denso oem. Now i am getting it done for $500 with one new coil and 6 plugs. I will drive my lexus for a year and so and will sell it off it has already 100000 miles

igzy

Typically I only replace what's broke, i.e. if it ain't broke - don't fix

Mine is at 160K+ on original coils (*touch wood*). I replaced the plugs at 120K. Btw, the coils and plugs on the firewall side can be replaced without removing the surge tank (aka upper intake)...