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Old 04-09-2019, 01:19 AM
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What happens if you cut the oil pressure switch wire?

I just did the CCV valve on my 06 E53 M54 and noticed the previous owner cut the wire to the oil pressure switch.

What would possess someone to do that?

And why isn't it throwing a check engine code?

Can anyone answer either of those questions?

Edited to add: How many wires go to it? I see the brown wire coming out of the harness. Is this the only wire to reconnect?
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Old 04-09-2019, 06:40 AM
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Old 04-09-2019, 09:02 AM
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Probably disconnected because it was coming on due to low oil pressure. Interesting that BMW decided to make that a normally closed switch.
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Old 04-09-2019, 11:16 AM
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Quote:
Originally Posted by 80stech View Post
Probably disconnected because it was coming on due to low oil pressure. Interesting that BMW decided to make that a normally closed switch.
Wouldn't shock me. When we bought this thing we took it for an oil change.

The dipstick was stuck in the tube.

The oil filter was so gummed up and stuck it took two guys to rip it apart to get it out.

The oil was so low it wasn't registering on the dipstick.

But we did two synthetic oil changes within 300 miles and it's been running smooth for the past 9 months and 15,000 miles.

The Air intake boot to the throttle body has that little bellow to the idle Air system. I discovered yesterday that it had been "repaired" with electrical tape and 6 zip ties ?!?!? Absolutely did not seal. Don't even know why they thought zip ties would do anything, they look like they made it worse.

So yeah, wouldn't surprise me if they determined the low oil pressure light coming on was an annoying inconvenience. Or maybe the sensor is broken and kept flashing or something.

I'll buy a new sensor either way just to be sure it's a working unit, then figure out how to solder the connector back on. It got snipped right at the connector, not much to work with.
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Old 04-09-2019, 11:24 AM
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Take the plug into the dealer's parts department and they should be able to sell you a repair kit for it.

RealOEM.com - Online BMW Parts Catalog
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Old 04-09-2019, 11:26 AM
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Thanks Zulu, will do.

Based on the $4.89 I paid for a single banjo fitting crush washer at BMW yesterday I'm guessing it will cost more than my replacement sensor LOL.
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Old 04-09-2019, 01:39 PM
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Maybe the seller figured the car would be tougher to sell with the oil pressure light on.

I'll guess that the oil pressure light does not come on (as it should) when the key is turned to ON, before starting the engine. Noticing that would be something to check for when first evaluating a car before eventually diving in there.

Glad to hear you've got it running well now.
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Old 04-09-2019, 04:22 PM
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Whole lot easier to fix than the one a member ran into back 12 or 13 years ago. In that case the LED had been removed from the board in the instrument cluster. With a little long distance coaching we got a new LED in Radio Shack and soldered it on to the board. Then the airbag (if I remember correctly) problem became apparent. Fixing that took a whole lot more time and money.
To answer your "other" question: The sensor trips a warning light. Oil pressure is not an emissions related problem so no CEL.
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Old 04-09-2019, 06:39 PM
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Quote:
Originally Posted by 80stech View Post
Probably disconnected because it was coming on due to low oil pressure. Interesting that BMW decided to make that a normally closed switch.
Isn't that the safer way to do it? (BTW, that's what I think but it's also a real question)

When power is on, engine not running, no pressure, switch is closed, warning light comes on.

If oil pressure stays low, light stays on.

If the switch somehow fails it's more likely to do so in the off position, light stays on.

If oil pressure is good and the switch is working, the circuit opens and the light goes out.

What could possibly go wrong, unless in the extreme hypothetical case someone would cut the wire. Seriously, who does that?
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Old 04-09-2019, 08:06 PM
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Quote:
Originally Posted by oldskewel View Post
Isn't that the safer way to do it? (BTW, that's what I think but it's also a real question)

What could possibly go wrong, unless in the extreme hypothetical case someone would cut the wire. Seriously, who does that?
My BMW motorcycle is the same (exact same switch actually) - the only real PITA is when the switch fails (and they do...) the oil pressure warning light comes on, giving you a heart attack when you're out in the mountains and then wasting an hour of your time tracking down a "low oil pressure issue" where none exists...

As for who cuts the wire? The dude that cannot be arsed opening the cluster to remove the LED....
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