Multiple DTC Priority

WARNING: This page is about a different car, the 2002 Suzuki Vitara. However, it is still accessible from the selected car via links, so may be relevant.

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).