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What causes the engine light to come on?

Just bought the car and dont have a manual yet

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It could be a number of reasons. it comes on when a sensor on the engine sences something is not runing right on your motor

Posted on Jan 18, 2009


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HELP!!! 99 Forester - Both Tail lights dont work and check engine light came on today. any feed back will help

there are 2 fuse boxes, one under the hood in the vicinity of the battery. the other box is usually on the drivers side either under the dash by your feet on the left, or where the door meets the dash. Occasionally it will be found in the glove box on where the passenger door meets the dash.
First thing to do is check the basics, oil level and coolant level in reservoir. (concerning the engine light) If the oil and coolant level is fine you should be safe to drive it to Auto Zone (or other such store, however Auto Zone does it for free) and have them plug in the computer to determine the cause of the engine light, it could be any number of things even the gas cap.
The tail light could be a fuse, however if no fuse is blown it could also be loose wiring. if you do not have an owner's manual, a really great investment is a repair manual, Chilton has the 1999 Forester online at this will have step by step instructions on removing panels to check wires and replacing lamps.
check to see if the brake lights work and if they are a different bulb than the tail lights, I had a similar problem in an old Cavalier where the brake lights worked but the tail lights didn't, my problem was in the switch where you turn on the headlights/turn signal. Have a friend help determine what, if any, lights are working in the rear and front of the car.
Auto Parts stores have diagnosis equipment for common issues and are generally very helpful if you have a question about what may cause a problem. ( I have only had a problem with Pep Boys when it comes to being helpful.)
I wish you luck.

Jul 17, 2012 | 1999 Subaru Forester

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Just bought a used 2001 Hyundai Elantra and the second day I drove it the check engine light came on.

You can go to Autozone and they will scan it for free and tell you why its on. If you dont notice anything and it drives normally, then it's probally an Oxygen sensor. It won't hurt anything if you keep driving it will just use a tiny bit more gas than normal. I would have it scanned anyways. You can also open the gas cap and let the pressure off the tank if there is any pressure in it. Sometimes that causes the check engine light to come on. If you bought the car from a car lot and the check engine light wasn't on the disclosure, they should have to fix it or you can file a complaint against them with their field investigator at the DMV. A good scanner can tell how many times the check engine light came on and when the code was cleared. If it was cleared right before you bought the car it usualy means the car lot tried to get away with not fixing the problem. Good luck and I hope it's nothing too serious.

Jul 31, 2011 | 2001 Hyundai Elantra

2 Answers

2006 vw passat. screen says stop! warning low oil. engine off ? what does that mean? Also servive engine now! I just bought the car yesterday and it has no owners manual. I did notice what looked like...

First, check your engine oil level , while on level ground, add if it's low. (The oil viscosity should be labeled on the oil filler cap) Blue smoke is a sign of burning oil, not a good sign. White smoke is a sign of coolant mixing with your engine oil, a worse sign.
Your computer is telling you to check your oil, so do it, or get it done.
If your oil is low, top it off and keep checking it regularly to see if your engine is consuming it. If it is, I would recommend getting it looked at for either a leak, or low compression. (Worn out piston rings will cause oil consumption and poor performance.)

Apr 06, 2011 | Volkswagen Passat Cars & Trucks

1 Answer

Locating camshaft sensor in 1996 geo metro

So what engine is in it? It always helps to state which engine you have, trans, 4 door ect. Should be near the harmonic balancer either attatched to ther front of the engine, or bolted to the engine block.

May 12, 2010 | 1996 Geo Metro

1 Answer

I am looking for the real manual that comes with the 2007 jeep patriot, limited edition. i dont want to buy because one should have came with my jeep and it didnt, now im having engine problems and dont...

The manual would tell you totake it in to the dealer and you should of asked for the manual when you bought the car, it is very difficultto get one and for free even when they are new. For my 2008 ranger I ad the book but had to pay $50.00 for the cd that aslso came with it. cars are no longer the same if you have a yellow check engine light take it into the dealer now, if it is flashing all the time take it in right away, if it has a red check engine light don't drive it have it towed to the dealer it's still under warrenty and won't cost you anything. if it has a symbol like this in yellow ([[[) IT MEANS YOU HAVE LOW AIR IN A TIRE AND NEED TO blow up tire or inflate tires to proper pressure which should be 28 32 psi.

Apr 11, 2010 | 2007 Jeep Patriot Sport

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A light came on in the dashboard instrument cluster while I was driving that looks like the drawing of an engine. I just bought this car,(1999 Porsche Boxster), the dealer is closed today,and none of the...

As long as the CHECK ENGINE light is on steady, you can very gently drive it. If it starts to flash...turn the engine off immediately.

Have the code checked by the Dealer.

Jan 31, 2010 | 1999 Porsche Boxster

2 Answers

I bought a saturn vue with a Honda v6. I can't find the trans-axle dipstick where the manual says. can you help?

Hey Guru???
What'd you do rank yourself a guru? Cause you sure don't KNOW what you're talking about.
Honda V6 3.5 engine is in the 2004-2007 Saturn Vues with 6 cylinder engines. It is the ONLY V6 offered. The old version was from Opel.
The trans dip stick is on the right side of the engine while the oil stick is front left.

Jan 01, 2010 | 2006 Saturn Vue

2 Answers

My brake lights wont work,i checked all the fuses,bought new bulbs,and bought a brake switch,and still regular lights come on,just my brake lights dont work.dont no if this is part of the...

Just had a similar problem. Brake (stop) lights and horn didn't work. Couldn't find mention of stop lights in fuse chart. Found horn fuse to be slot 21 in the engine fuse block (not the fuse block in car interior). Replaced 15A fuse and all now ok.

Aug 21, 2009 | 2005 Mazda 3

2 Answers

Transmission not shifting when cold engine light on.

I have two echo at home a 2001 and a 2004 bought new the two of them. And my sister bought a 2003 new herself. They always function that way. As long as the temperature light dont close (showing the fonction temp is ok)the trans dont go in third in normal use

Jul 30, 2008 | 2001 Toyota Echo

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