Were the codes cleared after replacement of parts?
P0101 Mass or Volume Air Flow Circuit Low Input
P0172 System too Rich (Bank 1)
P0175 System too Rich (Bank 2)
P0401 Exhaust Gas Recirculation Flow Insufficient Detected
P0420 Catalyst System Efficiency Below Threshold (Bank 1)
P0430 Catalyst System Efficiency Below Threshold (Bank 2)
The rich running condition leads to P0172 and P0175. These codes do not indicate any particular component.
Rich running conditions for extended periods leads to failed catalytic converters due to excessive fuel getting to them causing overheating.
What you need to address now would be the EGR (P0401) and MAF(P0101) first.
Saturday, September 15th, 2012 AT 8:57 AM