Multiple DTC Priority

If two or more DTCs are stored, proceed to diagnosis of DTC which was detected earliest. If no instructions are given, troubleshoot DTCs according to following priorities:

• DTCs other than DTC P0171 and P0172 (Fuel system too lean/too rich). DTCs P0300, P0301, P0302, P0303 and P0304 (Misfire detected) and DTCs P0401 and P0402 (EGR flow malfunction).
• DTCs P0171 and P0172 (Fuel system too lean/too rich) and DTCs P0401 and P0402 (EGR flow malfunction).
• DTCs P0300, P0301, P0302, P0303 and P0304 (Misfire detected).