Here are some suggestions...
For fault 140 thermostat you may also want to check thermostat wiring connector by t-stat and also DME (disconnect inspect clean)
For fault 185 leakage... try this; The wiring to the Fuel tank leak pump chafes on the L/R inner fender liner and cuts the wire in half or opens the insulation and the wire corrodes. Pull the L/R wheel and then remove the fender liner. You will probably see a spot on the liner where the wire has rubbed. Find the break in the wire and fix it. Reroute the wire so it does not chafe again.
For fault 106 replace the brake light switch under the dash
SOURCE: z3 brake light sensor
lay on your back in the drivers side and look up... it should be located just behind the brake pedal... move the brake pedal by hand and you should see the switch move
SOURCE: engine misfire and some times does not start when cold
Replace the Oxygen sensor. All your trouble codes are downstream of the oxygen sensor, and are related to it.
Once you replace the oxygen sensor (replace with a BOSCH sensor!), remove the positive battery cable, step on your brakes for 10 seconds, then reattach the cable. This will clear the codes from your ECM (Electronic Control Module).
SOURCE: Bmw 1999 528i replaced exhaust camshaft sensor
your code reader cannot read this fault ,manufacturers only pins are used in the OBDII connector and they are copyrighted so snap on and autozone havent got the equipment to test them .Dealer only,your lucky because in europe its only cars from 2005 that have OBDII connectors and evan then the software is encrypted to stop yours truely ,and where does one get an OBDII cable with all 17 pins connected ?? answer you cant because their copyrighted to each manufacturer
SOURCE: My 1995 525i has fault code 12210 O2 sensor
if the 02 sensor is unplugged and you are reading a scan tool from the diagnostic link then of course the 02 reading is wrong
if you are using a volt meter right at the connector thats on the sensor then the 02 will read lean because the heating elements in it are disconnected when you unplug it
check 02 voltage with engine warmed up and 02 sensor connected you will have to pierce insulation with your probe
SOURCE: I replaced my head gasket on my 2000 528i BMW. Now
Good evening Daniel,
Congrats on replacing the head gasket successfully! In regards to your secondary air system. I would first start with the electrical air pump supply located on the passengers side of the engine compartment. You can locate the supply hose (about 1 1/2 inch diameter) at the front of the exhaust manifold. The hose connects to the secondary air valve. Make sure the hose is connected. Also make sure if there is a vacuum supply line to the secondary air valve, that it is not broken/or disconnected. If the hoses are ok and secure, then remove the larger supply hose from the valve when the engine has not been started for 4-5 hrs and make sure you have air flow from the air pump. The pump should be audible and operate for approximately 30seconds to a minute. If you are still having issues after these checks, I can list other possible causes.
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