I need help interpreting these oxygen sensor scanned readings.
2003 525i 160k miles
Both upstream sensors are new Bosch
Both downstream sensors are original
Previously I replaced the CCV which was causing a large leak
Replacing the upstream sensors solved the readiness registers not setting
Recently, I have been noticing a loss of power/acceleration/speed. I can't get passed 40mph.
A few months ago I got some codes, but the codes went a way, so I didn't think anything of it: P0430 (Catalyst System Efficiency Below Threshold, Bank 1) and P0420 (Catalyst System Efficiency Below...
I'm sure someone has had this issue... I have the check engine soon light on, with the error reading Emissions Related Fault. The OBDII reader came up with codes P0430 Catalyst Efficiency Below Threshold (Bank 2) and P0491 and Secondary Air System (Bank 1). Need help on this one peoples... No...