The check engine, VSC, and 4WD lights keep coming on at the same time.

Asked by Aug 22, 2015 at 05:45 PM about the 2007 Toyota RAV4 Base

Question type: Maintenance & Repair

The lights are on in my car.  Have had both oxygen sensors replaced.  The lights go off for a day, then they come back on.  One mechanic said maybe it needs a software update, other said maybe it was that the sensor was not an official Toyota part  (the front sensor was a Toyota part).  This car does have a recall on it for an oil consumption issue.  However, they have not figured out a remedy for it yet.  All other recalls have been addressed.  I screwed the gas cap on properly and lights are still on.  Any advice?

11 Answers

Have you had - or did the mechanic do an OBDII scan? And 02 sensors really should be Denso. But not absolutely critical.. other brands will work and not cause the CEL to come on

4 of 4 people found this helpful.

Also, there is nothing wrong with the VSC. Toyota/Lexus uses not only the braking system, but also controls the throttle to help get the RAV out of tricky situations with VSC. If the engine is not running right, the ECM shuts down those systems

3 of 3 people found this helpful.

My Toyota Rav4 suddenly had VSC, Check Engine, & 4 wheel drive lights come on and stay on. Also noticed a little rough idling when first starting my vehicle. Took it to my local dealership and they immediately diagnosed the problem as a loose vacuum hose! Checked it and, sure enough, a hose had worked loose. They reconnected hose, reset lights, and all is well for now! Hope that is all there is to it! Zero cost for repairs! Thank you Bristol Toyota!

12 of 12 people found this helpful.

Hi Evie, My RAV4 is doing this exact same thing. The code came up "Lean Fuel" which my mechanic said could be an O2 sensor or possibly 5-6 other things. He cleaned my spark plugs and reset the lights. Lights stayed off for 2 days then came back on.:-( Could it be something as simple as a loose vacuum hose? I will ask. Thanks for the info. Fingers crossed!

2 of 2 people found this helpful.

It was a loose gas tank cap.

2 of 2 people found this helpful.

It takes a few tries and a few days.


On my 2011 RAV4 this is all due to a poor design of rubber tubing downstream (to the left) of the Mass Air Flow Sensor. This tubing is a "press fit" into the air manifold and twice it has worked its way out of the manifold. When it does, the 3 lights that come on are always VSC, Check Engine & 4WD. Before taking your vehicle to any dealer, please open your hood and look to the manifold to the left (downstream) of your air filter. Stupid design gives all of us RAV4 drivers many moments of apprehension that are unnecessary. To get the fitting end back in all of the way in the air manifold takes some hard pressing. There should be a mechanical fastener there so this does not occur, but the connection is at a funny angle and there is really no way to rig anything.

4 of 4 people found this helpful.

Thanks Charles and others who had commented on the rubber tubing coming loose. That exactly was the problem I had with my 2012 RAV4. Travel through some rough roads probably had made it come off the connection which doesnt have any clamps or anything else to hold it in its place. Bad design.

1 of 1 people found this helpful.

I am so glad I found this post! It's been driving me crazy. I'm going to have my BF look at the hose tomorrow. FINGERS CROSSED!! :)

Can this issue happen even if it is not all the way off? Mine was not seated all the way on. I pushed it all the way back in and reset the code. I'll have to see if it comes back on.


My lights only came on when the tubing was all of the way out. Actually, the first time it happened I could hear a difference in the noise of air flow in the engine compartment. Both times I had a friend who could reset the code for me using a hand-held analyzer that costs about $50 at Harbor Freight.

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