Member
Hello, I recently purchased a 2004 330ci with 74,000 miles. After the third day of owning it, and running to get groceries it wouldn't start. Remote unlock, and all the accessories came on but it wouldn't turn over. No clicking like a bad starter or dead battery. I checked the codes and it showed bad O2 sensors and the EML light was on. I disconnected the battery to try and clear the codes like some have suggested but it still didn't start. After leaving it overnight I came back and it started fine. The EML light was off, and it has never come on while driving to put it into "limp mode" so that has never been an issue. Took it to the shop and they replaced both O2 sensors, and was running fine. Couple days later I come out to run errands and the exact same thing. Remote and accessories all work, but won't turn over and EML light is back on. Pulled the battery again, but now it won't start at all even after doing that. I've read it could be the mass airflow sensor or cam position sensor, but I've never had the limp mode issue so don't know if that would affect it starting. Any suggestions? Thanks!
Member
I'd check all the appropriate ground wires. Many times you have an electrical issue in any car it can be traced to a bad ground. If not that then sensors. This article indicates TPS and throttle actuators as their issue on the M3.
https://motoiq.com/project-e46-m3-pa...ded-eml-light/
Member
I've recently changed the Crankshaft sensor and both Camshaft sensors in my E46 and it has a strong crank but doesn't start. I'm thinking that it's the fuel pump, or the alternator, but i'm not sure. Any ideas.
Member
Honestly, it sounds like a bad battery to me. How old is it? If it's more than 3-4 years, just replace it with a new one. You may need to remove it to see a date code.
Jbird
If the dash lights come on but there is no clicking sound try another key, the key has a chip in it that says hello to the car and allows the car to start, it’s called the ews system
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