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Author Topic: P0171/P0174 codes: Could leaving the oil cap off result in these codes coming up  (Read 139 times)

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May 08, 2018, 08:57:42 PM

couchiedemon

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A week ago the EML lit and the OBD reader showed the above codes. I cleared the codes to see if they came up again. This afternoon EML and same codes. I looked under the bonnet and whilst there were no apparent holes in the pipework from the Mass Airflow meter I did notice that the oil filler cap was off (I topped up oil about 10 days ago and must have forgotten to put the cap back on. Thankfully the cap was still in the engine bay and there has been no major oil explosion). Could this have led to airflow metering issues resulting in the above codes?
2002 E53 3.0i, 2005 Mini Cooper S Conv,  Honda NC750X

May 08, 2018, 09:39:44 PM
Reply #1

henrym3

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The short reply is YES. and welcome it would be good if you gave some info on your vehicle ie year engine and I assume by now you have driven the vehicle since putting the cap on and you will let us know the result.
E53 X5 4.6is, Carbon Black, LPG, Paddle Shift, Dynavin N6, Lowered, 22"Wheels, Side Bars. Perfusion Exhaust
E30 M3 Black, S50B32 Engine, 6 Speed Box, Ireland Engineering ARBs & Big Brake Conversion, Lowered, 18"LMs, CF CAI, CF Splitter & Barge Board, ZM3 Quad Exhaust.
VW R32 Gone

May 08, 2018, 10:14:27 PM
Reply #2

couchiedemon

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Thank you. V helpful. The car is a 2002 3.0i with 76k miles.
2002 E53 3.0i, 2005 Mini Cooper S Conv,  Honda NC750X

May 16, 2018, 08:23:18 PM
Reply #3

strummer

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The throttle bodies give problems on these around your mileage I replaced mine at 75k and again about 120k when worn will bring on the eml