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You can clear the codes with related code scnner, such us the Super Scanner ET801 BMW Code Scanner, it can read and erase trouble codes for all bmw series between 1997 to 2008 year.
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Remove wheel undo the large nut from the hub ,and punch the axle in wards , jack car up and place on stands undo hub from the strut undo ball joint unbolt axle from gearbox flange
Try clearing the codes, then restart, see what codes still come up. To manually clear the codes disconnect the neg battery post, leave off for 10 minutes, re-attach. If its OK, only the 12 code will show up.
If the car is pinging you will set a knock sensor code.'
This comes from bad gas and running lean., You really need this professionally inspected to rule out the basics. I have seen alot of nissans with the knock sensor code stored but the light is still off.
Fill up the tank with high octane chevron and some techron injector cleaner and clear the light. If it stays off for a couple days then go get it inspected. Even if the code is stored it will still pass as long as the light is still off and the monitors have run.
check the mass air flow sensor there maybe dirt on the filiment inside the sensor causing false readings. cleaning or replacing it may make the codes go away.
the cabin air filter is located behind the glove box...just take everything out of your glovebox ..then notice at the top how its held in easiest way is to remove the phillips head screws along the bottom at the hinge ...then look straight in its rite between the blower housing and the evaporator housing...hope this helps.
P0440 is a EVAP leak detected, try changing the gas cap and reseting the ECM to clear the service engine light. If you can not clear the code it takes about three start up with out any issues to clear the code and after 100 start up's the codes will clear from the ECM's history.
Note use the GM OEM gas cap for a replacement, anything else is just garbage and you'll be replacing it again with in 6 months. If it's not the gas cap, need to take it to a garage and have them do a smoke test to locate the leak in the system.
Good luck and hope this helps, keep me posted. be glad to help
To clear codes on these, you can disconnect the battery, then re-connect. The only code remaining will be one indicating battery power was interuppted. This will not work on 98 and newer vehicles.
Did you check the circuit breaker on the drivers side fuse block? There are 2, above the fuses, and are rectangle in shape with a metal cover. It'll be the one toward the front of the car i believe. Also, it usually can be reset.
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