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Toyota Highlander Check Engine Light



  • Similar to others, my check engine light has come on several times after an oil change. The cause was a lose vacuum hose. Most recently after the same problem, I was able to find the hose and reconnect, but i do not know how to reset the check engine light. Should it go off automatically or can i reset?
  • bikeman3bikeman3 Posts: 85
    freddeee as far as I know it will go out itself. A technician can reset it but will probably charge you. Ask at a local autozone store
  • Thanks for the advice. I will do that
  • rdw1rdw1 Posts: 8
    Highlander Maintenance Required Light is on

    I received this message from a Good Man that I would like to say Thanks.

    This is what he sent. It worked for me before, but this time, it is not working. I put synthetic oil in mine and don't need to change it as often and I still get the light. It has worked a couple of times for me but this time I am having a problem getting it to work.

    I was able to reset by holding odometer button down while turning off ignition switch and turning ignition switch to on and watching dashing go from 5 to 0 and the maintenace odometer resetting to zero. The Light would go off. Let me know if it works for you.
  • tom154tom154 Posts: 8
    edited March 2011
    I replaced my front o2 sensor last year (amazon Bosch OE $114)and getting the check engine light on again this year. Very easy it was right there when I opened the hood. Napa said that its the same o2 sensor code. Do these sensors go bad or could it be something else causing it. I just had the spark plugs replaced yesterday (Dealership $197) after 131,000 miles thinking that would shut it off. No luck. Light went back on immediately after I re connected the battery and started the car up. Any idea what I should check next that may be causing this o2 code and my light to go on ?
  • tom154tom154 Posts: 8
    Can anyone tell me where my Bank 1 Sensor 1 O2 sensor is located on my 2003 Toyota Highlander.
  • jrfierojrfiero Posts: 123
    Please see posts 4360 and 4362 in the Maintenance and Repair forum.
  • tom154tom154 Posts: 8
    I just completed my change out after following some advice from posts 4360 and 4362 in the Maintenance and Repair forum. It is very difficult to get a good look at the sensor but once you get your angle my technique it’s not that bad. Go from under the car. I used a 7/8 open end wrench. I then pushed a pipe against the bottom of the wrench while lying w/ my head towards the back of the truck. I was able to now hit the end of the pipe w/ a hand sledge about 10 or 15 times until it loosened. I did use WD 40 first to lubricate (watch for dripping). When it came to unplugging it from the harness. Be sure not to unscrew the sensor all the way you will need the tightness of the wires to unplug. I first practiced on the other "easy to get to sensor" right under the hood connected to the manifold. I was able to the just grab the clip (since I practiced) and pull the wire w/ one hand from under the car. It just popped out no problem. I did disconnect the battery to reset the computer and so far after a couple of miles no check engine light. Crossing my fingers.
  • tom154tom154 Posts: 8
    Thanks got it changed. That was a big help.
  • tom154tom154 Posts: 8
    did this fix work for you. Did you ever ever change the last o2 sensor after the cat.
  • roddy5roddy5 Posts: 2
    As many forums that I have looked at, I am a little confused about which sensor is easy to see near the manifold. Diagnostic says bank 1 sensor 1, but some say it is right there and easy to see, and some say it is near the firewall on the other side of the engine. I went to Performance Toyota and the parts guy refused to sell me the part because he wanted to take the suv to his shop and that I am not qualified to change it. Anyone have any luck finding right part and where did you have it switched out?
  • jrfierojrfiero Posts: 123
    Its all in 4360 & 4362 in the Maintenance and Repair forum. Assuming you have a V6, the Bank 2 sensor is staring at you when you open the hood, Bank 1 is near the firewall.
    Your "parts guy" is either misinformed or lying.
  • roddy5roddy5 Posts: 2
    Thank you very much for your info. I do not have a lift nor the equipment to do the job. If the parts guy is shaky, would you trust the service guy at the same place?
  • planedoc14planedoc14 Posts: 1
    edited July 2011
    After servicing my 03 Highlander, was taking a trip and the trans o/h light came on. I pulled off the road and before I even got stopped, the light went out. Continued on the trip and after 25-30 miles
    had the same thing happen. Again, pulled off and again the light went out. Went to a local dealership to have things checked out. The tech checked things out and could find no problems. Fluid still red and no burnt smell to the fluid. Left the dealership in good shape but the cycle happened again only after 50 miles. All of these cycles have happened on the interstate doing 65-70. There is no hard shifting, slipping, or any other noticeable issues. The vehicle was not close being over-loaded. Does anyone have any ideas what could be causing this?
  • Toyota Highlander 4C, 2001, at 65K I replaced the Climate Control ($1,200), after couple of months I had to change two oxygen sensors ($450), I had to, otherwise car wouldn't pass smog test. I got I first car 15 years ago, it was a Ford Thunderbird with 73K on it and don't remember spending so much many. Maybe Toyota used to be reliable before, but NOT ANYMORE! Speaking of the Toyota dealerships... prepare to be robbed, and be thankful that they don't rape you pfysicaly as well...
  • I have a 2004 toyota highlander. ~ 6 mos ago had a check engine light come on and changed the air sensor. The check engine light has come on periodically since and goes out after an hour or so. It has not come on for ~ 2mos. Today had an inspection and although there are no error codes the emission will not pass because multiple sensors say 'not ready'. There has been no battery changes or jumps in hundreds of miles. The car has also developed some hesitation with acceleration...any thought?
  • We had a 2001 Highlander 6 cyl, 150,000 miles, owned it for 3 years, purchased used, great vehicle until it left us stranded. We had just taken it in for service at the dealership due to the check engine light coming on and we were going on a trip, so we had oil changed (always had it changed religiously), sensors changed, and some other work done to the tune of $963.00. Took off on vacation and about 1200 miles into the vacation I heard a knock in the engine, pulled into gas station and it took 4 quarts of oil !!!, limped to dealership 1.5 miles away, told engine was ruined. I called the first dealership about what was happening before I found out engine was ruined, the Service manager said they were hearing of problem when traveling at highway speeds. Never mentioned it before. Wife posted our being stranded on facebook and a close friend said they had the same thing happen to them while on a trip with their Highlander and they had to get a different vehicle also. Beware if going on trips, check oil when stopping, it may save you from getting stranded. Service manager said something failed in engine to let the oil out or burn it up as they saw no evidence of leak, crack or anything else. This was strange as we never had any problems before until we ended up stranded. Going through that much oil when it never did before leaves me with a lot of unanswered questions. Now that I think back I saw small specs of something on the back of the vehicle when filling up but thought it was from some other vehicle we passed or the road. Most likely it was oil but never did get a chance to check it out once we were stranded as we junked the vehicle. I am posting this as a warning since the service manager mentioned something to me (sorry he waited). Oil light only came on when we pulled off freeway. Only comes on when low pressure not low oil volume.
  • jrfierojrfiero Posts: 123
    If you search this and the maintenance forum for "oil consumption" and "PCV" you'll find numerous instances of high oil consumption at highway speeds, fixed by replacing the PCV valve. It's a known issue and a competent dealer should be aware of it.
    I'm suspicious of the timing of your problem just after a service. If a PCV valve was on their laundry list I'd discuss that with them.
    What did your engine do after you put four quarts in it? What do you mean by "limped?" Were you just being careful or did the car not run right? Exactly why are they saying it's "ruined?"
  • I had done the transmission oil & engine oil change at Valvoline instant oil change service station and right after 50 miles the check engine light was on. I came to this forum for some idea and there is lots of solution that other owner had shared about sensor problem, oil change, spark plug etc. But I went back to Valvoline service station and compliant about the problem and they inspected the vehicle with (U380 OBD2 LCD Car Diagnostic Scanner Fault Code Reader) and the check engine light is gone. Hope it doesn't pop up again. Saved some bucks from going to dealer and paying diagnostic charges.
  • I think there is a vacuum hose that sometimes comes off. Pennzoil usually knocks it off, but Valvoline is pretty good.
    You probably wont have a problem, if you do just take it back there and make sure they reattach it
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