What Does It Mean When The Engine Management Light Comes On?

May 12, 2009

Hi

I went for a service 2 weeks ago and they said my alternator belt had a slight split could this be something to do with my engine management light coming on?

Thanks!

Jen

May 12, 2009

Hi
I went for a service 2 weeks ago and they said my alternator belt had a slight split could this be something to do with my engine management light coming on?
Thanks!
Jen

Hi

The engine management light will come on for various reasons ,

You will need to do the error code check and see what reason shows up

then it can be diagnosed

May 12, 2009

Have a read here...

http://toyotaownersclub.com/forums/index.php?showtopic=85601

....and see if there is a member close by who can read the code for you, once you have the code post it here and we can help solve the problem.

November 5, 2009

Hi Guys,

I thought i would share this with you as a lot of these threads are all over the place and not clear on what to do, this is the cheapest fix i have come up with for your engine management light being on solid not flashing and the dreaded o2 sensor replacement.

1 : Firstly try cleaning your MAF sensor with a tin of carb spray see the link under technical information hints and tips....MAF sensor cleaning will cost you nothing..

http://toyotaownersclub.com/forums/index.php?showtopic=63346

2: If that does not work check all your fuses to see if any have blown.

3: If that does not work you need the error code to find out which of the 3 oxygen sensors have possibly gone, there are 2x pre cat, 1x post cat.

Now there are 4 ways of doing this, Mr T or a garage can do a diagnostics which will cost you about £40, or if you know somebody with a handheld diagnostics machine that can do it, or there are some guys on this site that offer to read your error code for free they have a hand held diagnostic machine you can use just follow this link:

http://toyotaownersclub.com/forums/index.php?showtopic=85601

or you buy one off eBay an OBD2 reader for about £25 , the 16 pin diagnostics connection is under the drivers side dashboard at knee height, or the way i done it:

If you are covered by a breakdown service, i am with the RAC, phone them and say your engine management light has come on i have pulled over to the side of the road and need assistance, i need your guy to come out and tell me if it is safe to drive my car to a garage, insist on them coming out.

They did come out for me and he pluged his diagnostic machine in and give me the error code for free.

The error codes i have found on these forums are :

Po141 or 0120 O2 sensor heater circuit malfunction bank 1 sensor 2 ( post cat sensor under the bumper )

Po135 O2 sensor heater circuit malfunction bank 1 sensor 1 (right hand side of manifold pre cat sensor)

bank 2 sensor 1 (left hand side of manifold pre cat sensor)

4: So now you can either go to Mr T or a garage which will charge you about £250 to replace one sensor or you can purchase the O2 sensors in the UK, i have just got a price they are roughly £80 each and they are the cheapest you can get or:

Get them in America copy and paste this link in your browser

http://www.automedicsupply.com/index.php?&...&height=768

You can get your oxygen sensors and the socket you need to get them out and delivery for half the price of any where in the UK seriously!!! so all 3 sensors plus the socket costs you about £120.

5: Then you can fit them yourself with the pictorial guide Les has made in technical information hints and tips oxygen sensor replacement :

http://toyotaownersclub.com/forums/index.php?showtopic=83024

6: Lastly after you have fitted your sensors you need to reset your engine management light on the dashboard, instead of taking it to Mr T who will charge you £50 for the privilage, simply disconnect your Battery for 10 minutes and it will re set your ECU

and if you have cured the problem the engine management light will stay out.

I hope this will help a few people, as this site has helped me save a fortune, Les you are a Mr2 God!

Neal

November 6, 2009

Hi Guys,
I thought i would share this with you as a lot of these threads are all over the place and not clear on what to do, this is the cheapest fix i have come up with for your engine management light being on solid not flashing and the dreaded o2 sensor replacement.
I hope this will help a few people, as this site has helped me save a fortune, Les you are a Mr2 God!
Neal

Thanks Neal

You have made my day :thumbsup: