I drive a 2008 Acura MDX. A Check Emissions light comes on and when I checked the codes I get the following 4 codes in order: P2413, P0404, P0134, P2251. Any ideas what it could be? I previously replaced an oxygen sensor about a year ago.
P2413 EGR system malfunction
P404 EGR control circuit range performance problem
P0134 Rear A/F (airflow sensor) bank1 sensor 1 heater system malfunction
P2251 Rear A/F (airflow sensor) VS circuit high
Replace the EGR if the valve stick open you can get these code. P0134 is a result of a open EGR , P2251 is a result of P0134..
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