2002 Chrysler Concorde Check Engine light and codes showing

2002 CHRYSLER CONCORDE
99,000 MILES • 6 CYL • FWD • AUTOMATIC
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SCOTTROCK
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Just had my oil changed and radiator flushed. Check engine light came on next day so had them run a diagnostic. Codes PO300 and PO153 show up.

I know what the codes are but what would you recommend I do to try and solve for one or both and in what order would it make most sense?
Nov 11, 2009 at 12:09 AM
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BMRFIXIT
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did the engine get wet

I would have it checked for tune up /coil
,check if have an exhaust leak
check fuses
check if any the wires touching the exhaust and or cut and shorted
replace the suspected O2 sensor if all tested OK
Nov 11, 2009 at 6:36 AM