Codes 120308 and 118001?

2013 BMW X3

170,000 MILES • 2.0L • 4 CYL • TURBO • 4WD • AUTOMATIC

ASHOK SAINI

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I have been struggling alone for 1 year to fix these codes. II had an engine change. I have resolved 120308 Charge air pressure too low by sealing all the connections making them air tight. I didn't change the seals but applied gasket maker everywhere which sealed everything, like intercooler pipe intake air, throttle seal area, breather pipe. But i am still getting 118001 fuel air mixture too lean. I get code 120308 off and on and also sometimes while taking turn my transmission malfunction kicks in. Very confused, please advise..

Jul 14, 2023 at 7:59 PM

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The error codes you provided are associated with BMW vehicles. Here's some information about each code:

120308: This code corresponds to the "Valvetronic eccentric shaft sensor guide" on a BMW.

118001: This code is related to the "Mass or Volume Air Flow 'A' Circuit Range/Performance" on a BMW.

So, I would make sure the air intake is in good shape with no cracks, if there were no leaks I would change out the MAF sensor and then clear the codes. Check out the images (below). Please let us know how it goes.

Images (Click to enlarge)

Jul 15, 2023 at 11:32 AM

ASHOK SAINI

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Thanks for getting back to me. My vehicle is BMW X3 2013 2.0 turbo N20 engine but your reference is related to N54.

Jul 16, 2023 at 9:47 AM

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My bad, sorry, here is the correct information. Check out the images (below). Please let us know what happens.

Image (Click to enlarge)

Jul 17, 2023 at 9:54 AM