I have a '99 Camry 4cyl and the check engine light will not go off. It was throwing two codes that had to do with mass airflow sensor/oxygen sensor.. Replaced the oxygen sensor, cleared the code and the light still comes on. I hear this car doesn't even have a mass airflow sensor. Usually the car runs great except there is sometimes a little lag while accelerating, and every once in a while the car doesn't want to start unless you give it a lot of gas.. once you get going down the road it's fine. Any ideas?
2007-04-02 04:30:29 · 12 answers · asked by lseratigator 2 in Cars & Transportation ➔ Car Makes ➔ Toyota
There are many components that work together in the engine to maintain optimal engine performance and economy.
A service engine soon, or check engine light indicates that there is a sensor that is reading a condition that is "out of range".
Simply resetting the light does not solve the initial cause of the problem.
Replacing a number of parts trying to troubleshoot the problem in the hopes of getting the light to stay off is a tremendous waste of time and money.
The simplest, and most economical way to alleviate your issue, is to have the computer codes checked by a reputable shop to determine what caused the computer to signal you to begin with.
That being said, if per-chance you feel the need to reset the light in the hopes that it was a "glitch" of some kind, you could disconnect the negative battery terminal for a couple of minutes to clear the check engine light.
O2 Sensor? Probably NOT the problem.
People like to blame the O2 sensor for the problem because that's where the computer fault appears.
However, nine times out of ten, it's not faulty. It is simply reading a condition in the engine that is causing it to send a signal to the computer that there is a fault in the exhaust emissions mixture.
In a V-8 engine if you have a fouled spark plug, the air/fuel won't ignite and cause a rich condition in the exhaust which the O2 sensor reads.
So, there's 8 possible problems.
Loose spark plug wire 8 more possible problems.
Faulty injector? 8 more possible problems.
Vacuum leak? 8 more.
So, there's 36 possible problems that could cause the O2 sensor to trip the computer. Not to mention fuel supply issues, timing, EGR, bad gas, rotor, distributor cap,
Before you yank the O2 sensor and replace it, check the basics first. Otherwise, you could have wasted time and money on the result, not the cause.
2007-04-02 04:36:35 · answer #1 · answered by Mr. KnowItAll 7 · 1⤊ 0⤋
Toyota Check Engine Light
2016-10-02 04:12:49 · answer #2 · answered by ? 4 · 0⤊ 0⤋
What a coincidence..
I also have a 99 4cyl Camry and the engine
light won't go off and I have been unable to
find the problem....I believe it is something
in the fuel vapor absorption cannister that
connects to the fuel tank...My Camry has
150,000 miles and has never given me any problems.
I took it to the dealer last year to look at when I had
an inspection sticker due, He gave me a new inspection
sticker and told me not to worry about the light, he
couldn't seem to figure out how to fix it..
2007-04-02 04:37:04 · answer #3 · answered by Anonymous · 0⤊ 0⤋
RE:
Toyota Camry - Check Engine Light won't go off?
I have a '99 Camry 4cyl and the check engine light will not go off. It was throwing two codes that had to do with mass airflow sensor/oxygen sensor.. Replaced the oxygen sensor, cleared the code and the light still comes on. I hear this car doesn't even have a mass airflow sensor. Usually...
2015-08-04 13:43:12 · answer #4 · answered by Pamelia 1 · 0⤊ 0⤋
I used to have a 99 Camry (I drive an 06 Fusion, now...you should totally get one) and the check engine light wouldn't go off in that one, either. I had a cracked distributor cap and a spark plug that was out, causing me to miss every so often. Check engine light always stayed on, and it had the same problems starting/accelerating as yours does.
Try getting your spark plugs changed.
2007-04-02 04:47:44 · answer #5 · answered by Anonymous · 0⤊ 1⤋
toyota camry check engine light
2016-01-24 03:40:27 · answer #6 · answered by Anonymous · 0⤊ 0⤋
The lag sounds like a clogged injector,or a related air-fuel mix problem,I would disconnect a battery terminal for a few minutes,to clear the codes,drive around a few miles then re-read the codes,and go from there.
2007-04-02 04:38:40 · answer #7 · answered by rdaltonsr 3 · 0⤊ 0⤋
Possible fuel pump. Cut a hose and put it into the gas line, put your ear to it (listen carefully) while someone turns the key over without starting it. If you do not hear the fuel pump for 3 seconds then that's what it is.
2007-04-02 04:38:13 · answer #8 · answered by Amber 3 · 1⤊ 0⤋
Engine check on after oil change
2014-07-08 06:06:05 · answer #9 · answered by Anonymous · 1⤊ 0⤋
It could have Toyotas infamous engine sludge problem, one of the signs is loss of power. You may have to spend thousands on a new engine so take it to a mechanic now, because its probaby too late
2007-04-02 11:08:47 · answer #10 · answered by Anti Christ 3 · 0⤊ 2⤋