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Emissions Component

2000 BMW 323CI: shows no codes until after two drive cycles, and then shows "manufacturer specific" codes (p1188/89)

Hi. I have two questions: 1) If I reset the codes with a scan tool, and take the car to smog station before the car's test cycles have completed, if there are no codes, will it pass? 2)If I take it after the test cycles HAVE completed, and there are only these manufacturer specific codes present, will it pass? (i.e., does it have to show the generic P0* codes to fail) Thanks!


Second question first... ANY trouble code manufacturer specific or not will cause your BMW to fail the smog test. First question... if you reset the computer with a scan tool you will erase not only the trouble codes but the readiness flags as well. The smog machine will see that the required readiness flags are not set and will fail the smog inspection. At least 4 readiness flags are required to pass the smog test, one of which has to be the fuel control (oxygen sensor and MAF mass Air Flow Sensor) readiness flag. This is the same readiness flag which will not set if there is a fuel control or air/fuel mixture problem. Trouble codes P1188 and P1189 are fuel control related. P1188 relates to banks 1 (this is the side which cylinder 1 is located on) having a fuel control problem and P1189 relates to bank 2 (the side opposing bank 1) having a fuel control problem. Trouble codes P1188 and P1189 can indicate a problem with any one of the emissions components responsible for fuel control, i.e. Mass Air Flow Sensor, Oxygen Sensor, Fuel Pressure regulator. Any one of these components can trigger a P1188 or P1189. The component/s might not be completely failing, but defective enough to cause a P1188 and P1189. I mention this only because if any of these components were completely defective they would probably trigger a trouble code relating to the specific component. I'm afraid you'll need to diagnose the entire fuel control system to find out which one of these components is causing the P1188 and P1189 before your vehicle will pass the smog test.

posted by SmogTips Support 05-12-2010 04:18 PM

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