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 Old 10-08-2019, 04:23 PM   #1
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Default Rich Trims P0172

Hi, If anyone could help I'd appreciate it. I have a 13 Speed3 fully modded that is throwing a P0172 code. Lt and St trims are full negative at idle pulling back fuel. I can drive for 300 miles without a light, as long as I don't sit at a stop for more that 40 seconds. I have cleaned the MAF and throttle body, changed plugs,air filter, WB A/F sensor and O2 sensor, cleaned the injectors, pressure tested the induction system from MAF outlet the the intake manifold, changed otc maps from Stage 1, 2 and 3 and removed access port completely to revert back to factory software. I have also modified the throttle inlet snorkel to accept the MAF directly to eliminate the boost system completely. (I thought of this after Cobb T.S. insisted that i have a post cat leak) All these test and procedures still result in high negative trims at idle and a P0172 within 2 minutes of idling. Also, with my Autel scantool hooked up at cold start, all pids seem to be normal for the first 5 minutes of running time, with no cel setting. At around 5 minutes and 160 f. the Equivalency ratio, A/F ratio and fuel go full rich. I have included data logs. Thank you for your help.

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 Old 10-08-2019, 09:09 PM   #2
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Is your MAF sensor an OEM part and specifically the right OEM part number? Aftermarket sensors don’t work right and our sensor is a different part number than for the non-turbo engine.

We have a similar issue with the primary wideband O2 sensor. OEM only seems to work properly. We can use a lot of non-OEM parts but, these two sensors need to be OEM and specific to this engine.

Most people throwing 0172 code have a faulty MAF sensor or have replaced it with non-OEM for our engine.

Data logs are not showing up for me.
2017 Audi Q5 3.0 T (supercharged) Stage 2+ EPL tune, JHM overdrive crank pulley, EPL supercharger pulley, ZF8 TCU tune, aFe/034 intake, modified air box. 480 hp.

Sunlight Silver '08 MS3 GT Mods: (Sold 1/25/2019 after 10+ years of ownership)
BNR Stage 1 (to fix smoking K04 turbo), TurboXS 3" Catless DP/RP "Stealthback" into stock CBE, Vibrant 3 inch Ultra Quiet Resonator in RP section, Magnaflow 3 1/2" exhaust tip, Mazdaspeed CAI w/air straightener and K&N conical filter, NGK 6510 Iridium IX one step colder plugs, Hypertech tune, Autotech HPFP internals, Stock BPV (works perfectly), Yokohama Advan Neova AD08R's (stock size on stock rims); Hawk HPS pads; SURE RMM; Grimmspeed EBCS (2 port mode), Bilstein B6's, SPC rear camber arms.

Last edited by MSMS3; 10-09-2019 at 06:12 AM.
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