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3-Series (E36) Chat relating to the BMW 3-Series from 1992-1999. Autodoodad Specific models include: BMW 316i, BMW 318i, BMW 318iS/ti, BMW 320, BMW 323, BMW 320, BMW 324, BMW 325, BMW 328.

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Old 03-19-2013, 06:12 PM   #1 (permalink)
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Eng code 0446 and 0420

Hey, ok i have my e36 m3. Recently my eng light came on. Checked codes i got 2 of them.
0446--evap emission syst,vent control circuit
0420--catalyst sys bnk 1. Is anyone familiar with these codes. Is code 0420 indicating a bad cat? Also since eng light came on i hear a bushing sound coming from fuel tank. Do code 0446 got anything to do with it. I thought my fuel pump was going bad but today while buzzing sound was going i removed gas cap n it stopped for couple seconds. Can it be that tank is building pressure and canister not collecting gasses? Am confuse so can someone one help me on this. Since am new to bmw's it worries me and kind of know that what ever is wrong is gonna be $$$$$$$$$.
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Old 03-20-2013, 01:42 PM   #2 (permalink)
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Anyone????
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Old 03-20-2013, 05:52 PM   #3 (permalink)
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P0446 Evaporative Emission Control System Vent Control Circuit Malfunction
Purge Flow Sensor Circuit Range/Performance
Charcoal Canister aka Carbon Collector Canister / Evaporator Valve
DIY :
1. Remove your spare tire.
2. You will now see an oval shaped black plastic covering with a threaded rod coming out of the middle.
3. Remove the nut and washer.
4. On the right hand side of the oval plastic piece you will see a flat covering that is molded to the oval piece. There is a plastic nut holding the end of this down. Remove that nut.
5. Pull the plastic piece straight up and out.
6. You will now see the charcoal canister with 3 lines going into it from the right hand side of the car (passenger side).
7. The two thinner lines (same size) have metal hose clamps on them.
8. They are snug, but with a screwdriver (flat) you can gently work the hoses off without removing the clamps.
9. Next, remove the thicker hose. (it just pulls off, wiggling side to side helps)
10. During the hose removal you may want to have a friend hold up the canister. It is not secured to the car and can slide up the threaded rod.
11. Once your lines are off, remove the canister by lifting straight up.
12. Installation is opposite of removal.
NOTE: There may be gas vapor in these lines when disconnected!


P0420 is Catalyst System below efficiency. Basically means your cats are failing. Depending on your milage this is not uncommon. Their only designed to last around 150k, and less if the PO was using less then 89 octane gasoline. Replace the sensors when you replace the cats.
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Old 03-20-2013, 07:13 PM   #4 (permalink)
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Ok, so the canister code basically means it needs to be replaced? Not a sensor on it? Replace complete assy? Where can i get it for a good price? And the also meeds replaced basically. I was looking for prices on cats and holly shhhhhh! They are extreamly expensive. Can i eliminate them amd replace with straight pipe or some aftermarket highflow ones that come without packing inside cause i read u can put some o2 simulators to prevent them from activating a code?
Thanks alot vader on ur imput like always
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Old 03-21-2013, 04:58 PM   #5 (permalink)
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Well you could run catless depending on your states emissions laws. If they do emissions testing you will not pass. The reason cats are so expensive is because they contain precious metals including Platinum. As far as I know their are ways to rig up a cat less setup without triggering error codes. I never looked into it because I prefer my car not smelling like an old diesel truck. Catless will smell terrible btw.

As for the charcoal canister, you should replace it. The only times ive heard of people permantly removing it are on dedicated track cars. Again, if you have emissions testing it will be mandatory to replace it or you wont pass. Replacing it is pretty simple.

BimmerSpecialist.com should carry them.
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Old 03-22-2013, 06:36 PM   #6 (permalink)
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Ok i understand. Reason y i was considering cat removal is because i am in florida n we dont do imissions( so glad lol). But yeah am looking into aftermarket cat options since they are cheaper. And i will order a new canister.
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Old 04-09-2013, 02:00 AM   #7 (permalink)
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Originally Posted by Lord Vader View Post
P0446 Evaporative Emission Control System Vent Control Circuit Malfunction
Purge Flow Sensor Circuit Range/Performance
Charcoal Canister aka Carbon Collector Canister / Evaporator Valve
DIY :
1. Remove your spare tire.
2. You will now see an oval shaped black plastic covering with a threaded rod coming out of the middle.
3. Remove the nut and washer.
4. On the right hand side of the oval plastic piece you will see a flat covering that is molded to the oval piece. There is a plastic nut holding the end of this down. Remove that nut.
5. Pull the plastic piece straight up and out.
6. You will now see the charcoal canister with 3 lines going into it from the right hand side of the car (passenger side).
7. The two thinner lines (same size) have metal hose clamps on them.
8. They are snug, but with a screwdriver (flat) you can gently work the hoses off without removing the clamps.
9. Next, remove the thicker hose. (it just pulls off, wiggling side to side helps)
10. During the hose removal you may want to have a friend hold up the canister. It is not secured to the car and can slide up the threaded rod.
11. Once your lines are off, remove the canister by lifting straight up.
12. Installation is opposite of removal.
NOTE: There may be gas vapor in these lines when disconnected!


P0420 is Catalyst System below efficiency. Basically means your cats are failing. Depending on your milage this is not uncommon. Their only designed to last around 150k, and less if the PO was using less then 89 octane gasoline. Replace the sensors when you replace the cats.
good job!!!!!!!!!!
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Old 05-06-2013, 02:04 AM   #8 (permalink)
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code table: Diagnostic Trouble Code (DTC) Table Free Download
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Old 06-06-2013, 10:00 PM   #9 (permalink)
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thx for your code table
i am looking for it
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Old 06-07-2013, 04:17 PM   #10 (permalink)
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Def a good post. Helped me out alot.
Thanks again vader
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