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- Sep 3, 2006
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So - my wife's 530i is suddenly causing some trouble. She tried to start the car to come home from work - and, according to her, "nothing happened". She said it was completely dead. By the time I got there, it had spontaneously started working and started right up. We drove it directly to our normal mechanic (a eurocar specialist). He ran tests on all the usual suspects: Alternator, starter, voltage regulator, battery. He determined the battery wasn't taking a charge. Everything else passed the diagnostics, so he only replaced the battery.
Car runs fine for exactly one day. Today, my wife went out, and it stranded her at the first place she stopped. Same thing. She says she inserts the key, turns it, and "nothing happens". I get there, put in my key, and it starts right up. I started it 5 or 6 times - no issues. I then used her key, and it *also* worked fine - no issues over 3 or 4 more starts.
I tried to get her to tell me more about what happens when it fails. Does the dash light-up when you insert the key? Does the BMW iDrive system come on? Does it show any messages? - She didn't know. :rolleyes:
So, here's my thinking for what could be wrong:
1) It could be her key. Perhaps the smart chip in the key is flaky, or the key is worn and not always hitting all the tumblers. If the car ever fails with with my key, then we'll know it's not just her key.
2) It could be the key switch. If the dash doesn't light-up at all, I'm thinking the key switch is a likely suspect.
3) Foot brake switch. If it was this switch, the iDrive system should be telling her this is the problem. But if she's not looking at the messages...
4) Starter relay. This was my first thought. The mechanic said he tested the starter - but I suspect all he did was look at the diagnostic codes and didn't see any errors.
5) Starter motor. My wife didn't know if she heard anything clicking. Again, the mechanic claims to have checked the starter.
6) Other undiagnosed electrical problem. Could be a frayed wire or some other nonsense.
This is going to be a pain in the arse to resolve. Intermittent electrical problems are the absolute worst, and having all the blasted electronics in the way just makes it a 1000X worse.
Am I missing any other possible suspects?
Car runs fine for exactly one day. Today, my wife went out, and it stranded her at the first place she stopped. Same thing. She says she inserts the key, turns it, and "nothing happens". I get there, put in my key, and it starts right up. I started it 5 or 6 times - no issues. I then used her key, and it *also* worked fine - no issues over 3 or 4 more starts.
I tried to get her to tell me more about what happens when it fails. Does the dash light-up when you insert the key? Does the BMW iDrive system come on? Does it show any messages? - She didn't know. :rolleyes:
So, here's my thinking for what could be wrong:
1) It could be her key. Perhaps the smart chip in the key is flaky, or the key is worn and not always hitting all the tumblers. If the car ever fails with with my key, then we'll know it's not just her key.
2) It could be the key switch. If the dash doesn't light-up at all, I'm thinking the key switch is a likely suspect.
3) Foot brake switch. If it was this switch, the iDrive system should be telling her this is the problem. But if she's not looking at the messages...
4) Starter relay. This was my first thought. The mechanic said he tested the starter - but I suspect all he did was look at the diagnostic codes and didn't see any errors.
5) Starter motor. My wife didn't know if she heard anything clicking. Again, the mechanic claims to have checked the starter.
6) Other undiagnosed electrical problem. Could be a frayed wire or some other nonsense.
This is going to be a pain in the arse to resolve. Intermittent electrical problems are the absolute worst, and having all the blasted electronics in the way just makes it a 1000X worse.
Am I missing any other possible suspects?