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Ron Z.
Ron Z., - Lexus Tech -
Category: Lexus
Satisfied Customers: 17968
Experience:  18+yrs experience. State Inspector and Lexus Diagnostics
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Vsc check engine light is on, just stays on, 2007 es 350,

Customer Question

vsc check engine light is on
JA: Does the light stay on, or does it blink?
Customer: just stays on
JA: What is the model/year of your Lexus?
Customer: 2007 es 350
JA: Are you fixing your ES yourself? What have you tried so far?
Customer: scare to drive it will have it towed to repair shop or dealer
JA: Anything else you want the mechanic to know before I connect you?
Customer: what is this service
Submitted: 19 days ago.
Category: Lexus
Expert:  Ron Z. replied 19 days ago.

Hi! Welcome to JustAnswer. Thanks for coming! I'm Ron and I'll be working with you on your question today. Please give me a moment to review your question and prepare your answer.

Expert:  Ron Z. replied 19 days ago.

When the Check Engine light comes on, the VSC light is also set, which turns this system off. This is a self-preservation mechanism, in case the reason the Check Engine Light is on can harm or effect the VSC system. So- fix the reason why the Engine Light is on, and the VSC system will come back online.

When the Check Engine light comes on, this is the on-board computer's way of telling you it sees a problem in one of the monitored systems. Unfortunately, there are literally 100's of parts and sensors monitored in various systems, and to take a "guess" as to which part/sensor in which system is faulty, is virtually impossible. However, if you are not experiencing any drivability issues such as skipping, stalling, shifting problems, etc, then more than likely, the problem is going to lie in the EVAP (emissions control/recovery) system. Very commonly, this could be a faulty, loose or missing fuel cap or even putting fuel in while the vehicle is running can set the light. Check the underside of the fuel cap for any cracks or signs of defects that may keep the cap from sealing correctly. If there are any doubts about the inspection of the cap, replace it. Keep in mind, you will need a cap that meets OE Specs. Those "universal" or "locking" fuel caps sold at after market parts stores do not meet OE specs, and will not seal the system correctly. Check the top of the fuel filler neck for any signs of damage or debris. Check under the vehicle, around the rear areas of the vehicle, looking for any vacuum lines that have dry-rot cracks, holes or loose/missing connections. If these all check out, then the best thing to do at this point is to have the Diagnostic Trouble Codes (aka "p-codes") read from the on-board computer. These p-codes are what is used as a "starting point" for the diagnosis and will tell which part/sensor, in which system, has the fault. There isn't a Mechanic on the planet that can tell you what is wrong with the vehicle just by "looking" at the Engine Light. Every single Mechanic's first course of action WILL be to obtain the p-codes. It's standard diagnostic procedure. Once you get these p-codes you can more accurately and efficiently diagnose the problem and then make the correct repair. You can have these p-codes read FREE (except in California) at any local "big chain" part store (ie. AutoZone, PepBoys, Advanced, etc).

As long as there are no drivabilty issues or shifting issues, then it is perfectly safe to drive the vehicle. You should however, have the codes retrieved at least to verify. If the problem does lie in the EVAP system, it is strictly for emissions control/recovery and will in no way effect engine performance in any way. If the problem lies outside the EVAP system, it may be a good idea to have it serviced as soon as possible, as prolonged driving with a problem with the engine or transmission can make matters worse.

Please remember to leave a rating using the 'stars' or click 'Accept'. A 5-star rating is much appreciated! Rating or accepting my answer does not cost you extra.

Expert:  Ron Z. replied 18 days ago.

Hi! I noticed this thread was still open, so I wanted to check in and see if there was anything else I could do for you on this issue? Any other questions you had? Was there something you wanted addressed that I may have missed in my answer? Did you find my answer helpful?

Expert:  Ron Z. replied 17 days ago.

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