Service Engine light and Oxygen Sensors

[Riggodeaux]

Update. I continued to get the Peake Table 19 F5, F6 codes [P0491,492 on Autozone's OBDII scanner] and added a table 19 3d code [post-cat O2 sensor] so I stopped by the dealer and had them do the official bmw computer scan. It tied the F5/F6 codes to the secondary air pump check valve and confirmed the one O2 sensor. The dealer's tech, always looking for billing opportunities, noted a leak around the valve cover gasket, too. The price quotes: $685 to replace one post-cat O2 sensor, $566 to replace the secondary air valve w/gasket, and $575 to replace the valve cover gasket. All easy DIY tasks, so I've ordered the parts [for these alone, less than $200, saving $1600+ over dealer rates] and will do the other O2 sensors and now-overdue sparkplugs while I'm under the hood. I don't notice symptoms, but I may do the preventative DISA valve repair [G.A.R. kit] while I'm at it. Any thoughts?

[lhordmclain]

This is my humble 2 cents
(oem vs genuine parts your call)

- O2 Sensor
* Since one has failed, I plan to replace the other as well
- secondary air valve
* Try cleaning it 1st with carb cleaner or buy new one
* replace the gasket
* I will plan to do the hoses too, if it turns out to be brittle
- valve cover gasket
* Like you, I did the all the spark plugs at the same time.
* I added RR vanos high pressured oil line and gaskets
* refreshed CCV/Oil Separator (mine was an updated cold weather already but it been 9-10yrs) and included the updated guide tube+hose from Oil Separator to Guide Tube + Dip stick O-rings
* I did not do vanos o-rings and other parts by beisan, your call if you
are up to it -> Beisan Systems - Procedures - Double Vanos Procedure

- do visual check for other items like serpentine belts, ac belts, CCV/Oil Separator.....
- top off the fluids (collant, engine oil, power steering)


Hopefully, I can drive down there again this summer music festival and stone mountain for my little one (daughter).

GL...

Originally Posted by Riggodeaux

Update. I continued to get the Peake Table 19 F5, F6 codes [P0491,492 on Autozone's OBDII scanner] and added a table 19 3d code [post-cat O2 sensor] so I stopped by the dealer and had them do the official bmw computer scan. It tied the F5/F6 codes to the secondary air pump check valve and confirmed the one O2 sensor. The dealer's tech, always looking for billing opportunities, noted a leak around the valve cover gasket, too. The price quotes: $685 to replace one post-cat O2 sensor, $566 to replace the secondary air valve w/gasket, and $575 to replace the valve cover gasket. All easy DIY tasks, so I've ordered the parts [for these alone, less than $200, saving $1600+ over dealer rates] and will do the other O2 sensors and now-overdue sparkplugs while I'm under the hood. I don't notice symptoms, but I may do the preventative DISA valve repair [G.A.R. kit] while I'm at it. Any thoughts?