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I am new to Mini so please bear with me. I purchased an 06 S with several modifications (they are listed below). The check engine light is on and throwing P0172 code. The Long Term Fuel Trim on Bank 1 is at -20% at idle and drops to about -10% at 3,000 RPMs.
The car runs great but I can't get it to pass emissions.
The car did not have a cat on it when I got it. I replaced both O2 sensors and put on new CAT.
Someone recommended replacing both MAP sensors? Is this the next logical step? Any other suggestions?
Just a note on the P0172 code link. '02-'06 MINIs do not have a mass airflow (MAF) sensor. They have two MAP sensors that work together to determine the proper air/fuel mixture. This is also known as speed density.
You have an aftermarket header and aftermarket exhaust. Look to see if you have an exhaust leak. This can cause false codes with the O2 sensors. Definitely check for vacuum leaks around the engine as well. Get a piece of hose and hold one end to your ear. Listen for a distinct hissing sound.
Another thought that comes to mind is you could possibly have a problem with your high-pressure fuel pump. Testing will require a mechanic's diagnostic.
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'06 MCS, AB/DS, #1/#2/#3, RMW Tuned, 15%, DDM CAI, GP IC w/DDM GP div., DT BPV, Brisk silver plugs, Invidia exh., M7 Ext. Scoop, GReddy AFR/boost gauges, M7/Cobalt F/R st. bars, H&R 25mm comp. R swaybar, BBS RK rims, Kicker speakers/amp/sub, Rock-Fos 1F cap, Westin driving lights, Angel Eyes lights, Gear Jammin' LED tail lights
Thank you for the advice. I am on the hunt. Did find that the rear O2 wiring was touching the heat shield. Fix that now the light is out. Fingers are crossed. I'll report back. Thanks.
