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Driveline, Engine & DME Tuning
Talk about driveline improvements, NA tuning and DME tuning your E46 BMW here. This includes diffs, intakes, exhausts, chips, software and OBD tuning.

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Old 05-23-2010, 11:13 AM   #1
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Join Date: Jun 2009
Location: pendleton, NY
Posts: 202
My Ride: '99 323i
Checked my cel, 6 codes.

alright, im more familiar with domestics when it comes to diagnostics, so some help would be greatly appreciated.

had a check engine light for about 8 months, decided to finally check it using a mac obd2 reader, some codes i searched online as it didnt have a description.

car is a '99 323i 5 speed sedan, 170k miles, runs fine, gets 27mpg. all stock.

codes are:

p0302 - cyl. 2 misfire
p1188 - bank 1 sensor 1
p1189 - bank 2 sensor 1
p1250 - fuel level too low (this one was in there twice)
p1477 - leakage diagnostic pump reed switch not open

my thoughts are one or two are causing the rest. i have ran the car where the low gas light popped on once or twice, but always filled right up asap.

my thoughts are to replace fuel filter and run a bottle of injector cleaner in a tank of gas, and clean the maf. but does anyone else know of anything that could be causing these? and what is a pump reed switch? my confusion is that the car runs so well and gets great mileage despite these codes.


'99 323i - daily hotness
'95 s10 - 355 sbc~500hp, 5sp manual, 4:10 gears.
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Old 12-01-2010, 09:05 PM   #2
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Join Date: Aug 2008
Location: Canada
Posts: 16
My Ride: 99 e46 328i 4door
ERROR CODE P1477 - Leakage Diagnostic Pump Reed Switch Did Not Open

1) Locate the leakage diagnosis pump, attached to the carbon canister under a black plastic cover between the fuel tank and the spare tire well, under the car.

2) Check for power to the pump on a red/white wire - battery voltage with car running from fuse 3 in the engine fuse carrier in the electronics box in the engine compartment.

3) Check for power on the control wire, brown/blue going to the Motronic control unit

4) Check the signal wire, black/green. When the control wire is grounded, the signal wire should show battery voltage out of the switch inside the pump.

5) Check the signal wire has continuity to pin 34 of the Montonic control unit and that the control wire has continuity to pin 30.

6) On the small vaccuum hose to the leakage diagnosis pump, check for intake manifold vaccuum with the car running.

Four E46's had this same error code.

*3 E46's had the Leak Detection Pump (LDP) Vaccuum Hose Repaired (in other words the vaccuum hose was loose or broken at the intake manifold)
*1 E46 had the intake manifold vaccuum line replaced

I got this info directly from a BMW mechanic so if you ask any questions i probably wont know the answer....!
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Old 12-02-2010, 10:09 AM   #3
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Join Date: Aug 2010
Location: Orange County, CA
Posts: 4,394
My Ride: 05 330ci
ummmmmm sounds likeee some miss fire... get new plugs and or coilss should fix something... start with plugs cuz there cheap and that should clear 1 or 2 of them!
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