Lexus V-12

Driving along I recieved a check engine light on my 1998. The engine runs fine and has 78000 miles on it. What are the common possibilities for causes? Any help would be appreciated.

sk72

It could be something very minor to something where you have to get it checked out. I had a similar situation before... getting a check engine light turned on while driving. I opened the hood and realized that my tranny dip stick was not in properly... so this kind of simple things could trigger the sensor.. check througly under your hood for any loose connections like this...

if you cannot find anything.. just drive the car up to autozone and since your car would use a OB2.. they have the equipment to check n let you know whats the problem is (FOR FREE) ..
good luck !!!

Pheonix

sk gave u the best advice anyone can give. Go get the code scanned for free. Most places do it, Autozone's do it by default & most places in North America have one locally.
Write down any codes that come up. Get back with us & we'll let you know what the computer tells you is the problem is & then we'll go over what are the likely possible causes of the problem.

(If somebody called the doctor & asks, "I'm sick. What's wrong?". Could the doctor give you an answer? Not really.
The same goes for cars. If you tell us your check engine light is on & don't tell us any symptoms, or information about the CEL. We can't really give you an answer either. We can give you several hundred guesses, but no real answer.)

Which is the great thing about computers now adays. For all intensive purposes, you don't *need* to know anything about your car if you don't want too. (Tho you should.)
All you *need* to know is how to descriptively describe anything that's going on & what the computer tells you.

LarryParker

Believe it or not, a possible cause is that the gas cap is not tight enough. That happened to me. I removed the cap, replaced it securely, until it clicked a couple of times, and removed and then put right back in the fuse in the engine compartment for the engine control unit, in an attempt to reset the 'Check Engine" light. It worked. It may not be necessary to pull the fuse, but I did it anyway.

that guy

It is offten the gas cap but it is a good idea to pull the fuse because on some cars it can take up to 52 key starts to re-set the check engine light

Pheonix

What in the hell...
Toyota/Lexus/Scion OBD-II

The longest stored codes are 2, to 3 trip codes. But just because it should trip on 2-3 trips for most things, doesn't mean it will.


He still needs to scan the code. Random, blind troubleshooting is not constructive.

Lexus V-12

Alright guys we have 3 codes that came up

P1155 Alternative Fuel Controller (2 times)
P1153 Bank 2 Fuel Control Shifted Lean
1998 with 78,000 miles on it (1mz-fe)
Thanks a lot guys for all the help I did not know about autozone free diag. Anywhere you go its 70 plus dollars for ONLY diagnotic, great tip.

Oh and the guy erased the codes when he did it (10:00 AM) and it was back on 30 minutes later!

Please Help!

Pheonix

Replace the main o2 sensors.

ssmoked

my o2 sensor is broken on my es300 96', the dealer said only original factory o2 sensor would work, not any after market o2 sensors. is that true or are they just trying to rip me off? thanks

Pheonix

Bull

buy your own sensors & change them yourself.

esandes

you may have some condensation in the gas tank or your fuel system needs a good cleaning. i would use a container of gas treatment and also octane booster with your next gas fill up. it does the trick when my "check engine" light comes on.

koolaidman

replace b1s1 b2s1 air fuel ratio sensor

koolaidman

and its not o2 sensors they are air fuel ratio sensors. there is a huge difference

Pheonix

Just like an o2 sensor isn't an o2 sensor. It's a lambda, or heated lambda sensor, or an EGO, or HEGO sensor.
3,000 names, but everyone knows what part you're talking abot.