I just checked on our standard BMW 540 V8 and the O2 sensors for pre and post cat are at 9 oclock (one side only shruggy ) . Had the car 10 years and never had a code come up for an O2 sensor. HTH's.

Last edited by Tig; 08/15/22 11:19 AM.
'74 Challenger..9.46 @ 145.9 1/4, 6.001 @ 118 1/8 so far. 4023lb !!! # N/A, Marsh performance 655ci, Indy Maxx, T/R, Indy 600-13 X's, Street legal, pump gas, full interior, Cal-Tracs, mufflers, 3:73's and real 10.5 radials.
9.51 @ 142.4 1/4, 6.003 @ 114 1/8 with our old mule KB, 572-13, 580 wedge.
RHD '68 Barracuda Fastback 323ci street/strip. Best ET 13.88 @ 99.03