Emission light come on wat should i do - 2000 BMW Z3

Jade Ironside, your catalytic converter may be clogged. Have it inspected.

Sounds like a bad catalytic converter.

There are couple of things that has to do with emissions ,1 gas cap 2. Catalytic converter. 3. You have o2sensors better know as oxygen sensors unless u get a check engine light on dash you should be good just make sure car is warmed up enough so that when you go all sensors are opened on car for better reading .good luck

Don't know why you would be here asking or driving
a vehicle with that issue & the emissions light on.
It should have been in a shop a long time ago
I'm going to guess & say the Exhaust Converter is worn
out & blocking the exhaust getting out & you have to check
why it failed & correct those issues before installing a new one

Hi there:
First, it is normal for the check engine light to come on momentarily when you turn on the ignition switch and then go out. If it stays on, then you have a stored code that indicates a malfunction of some kind in your engine or transmission control systems.

* The Check Engine Light comes on and stays on.
If the Check Engine Light illuminates constantly during driving with no noticeable driving or performance problems, there is a permanent fault in the emission control system. When this happens, the computer that controls the emission system usually has a backup program that runs while the fault is present. (These backup programs are often referred to as "limp home" mode programs.) You should get the vehicle serviced as soon as possible, but in most cases, the vehicle will continue to operate, though you run a risk of it dying or not starting.

* The Check Engine Light illuminates, stays on, and there are performance problems.
This means that a vital component of your emission control and engine management system has a serious problem. It usually involves a component or system needed for the vehicle to run at all. In most cases, drive the vehicle as little as possible. In many cases, the vehicle is not safe to drive at all -it could stop or stall out at any moment. It is best to pull over to a safe place and have the vehicle towed to an automotive diagnostician for a thorough inspection and repair.

I suggest visit some Autozone or AutoShop with OBD Scanner Reader in order to scanning the module to know exactly wat fault code is stored there; note this code number for additional details.

Hope this guide helps.

Hi there:
First, it is normal for the check engine light to come on momentarily when you turn on the ignition switch and then go out. If it stays on, then you have a stored code that indicates a malfunction of some kind in your engine or transmission control systems.


* The Check Engine Light comes on and stays on.
If the Check Engine Light illuminates constantly during driving with no noticeable driving or performance problems, there is a permanent fault in the emission control system. When this happens, the computer that controls the emission system usually has a backup program that runs while the fault is present. (These backup programs are often referred to as "limp home" mode programs.) You should get the vehicle serviced as soon as possible, but in most cases, the vehicle will continue to operate, though you run a risk of it dying or not starting.

* The Check Engine Light illuminates, stays on, and there are performance problems.
This means that a vital component of your emission control and engine management system has a serious problem. It usually involves a component or system needed for the vehicle to run at all. In most cases, drive the vehicle as little as possible. In many cases, the vehicle is not safe to drive at all -it could stop or stall out at any moment. It is best to pull over to a safe place and have the vehicle towed to an automotive diagnostician for a thorough inspection and repair.



I suggest visit some Autozone or AutoShop with OBD Scanner Reader in order to scanning the module to know exactly wat fault code is stored there; note this code number for additional details.


Hope this guide helps.

po305 is related to missfire on #5 cylinder
po440 is related to fuel tank pressure
pO441 is for evaporator purge flow malfunction
po446 relates to vent control valve electrical circuit malfunction

missfire is seperate from the other codes
as for the other three codes replace the vent control valve solenoid located near the charcoal canister the oth3er codes can relate to a faulty solenoid

after replacing light will only go out if you clear through a scan tool or three drive cycles of over 10 min each

Could be a bunch of things most likely some sort of emissions sensor. If you are close to an "Autozone" they can check the codes for you for free and this should tell you what is setting off the sensor

one of two things the first is you are due for Transmission service
and on some years it lets you know your trans. is slipping
have the obd codes checked

for fuel mpg. i used to have a 4.7 dodge ram and i
was geting about 14 mpg. on hyways.
as for the light go to a place like autozone they have
a free service they used the code reader and tell you
wat the problem is and they will advise you on repair
solution