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View Full Version : P0446 Intermittent - Evaporative Emission System Vent Control Circuit



harrison.kwok
09-24-2018, 01:28 PM
I did a search and did not find anything conclusive. I changed the purge solenoid valve (in the hood) and removed the shut-off solenoid (in the trunk) and tested it. Valves are working as they should. The canister in the trunk has no visible cracks. Hoses look good. The CEL comes on and off. I saw some posts about a software update - who has done the software update? How much does BMW charge?. Any advice on this issue is greatly appreciated. Thanks!

98 e36 M3 coupe - 160k