Q: codes P0021 P0011 keep coming up sometimes reader says pass but two monitors not on 2006 Hyundai Sonata

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
cars runs good oil light comes on with idle after warm- oxygen sensors changed- new oil - new oil control valves
(1) Answer
(6) Comments
Test actual oil pressure using manual test guage kit ... Suspect low oil pressure.... Possibly from engine sludge. .. Likely due to infrequent engine service/poor quality engine oil and oil filter.
That should be enough oil pressure **with engine idling at normal operating temperature** .. However at this point vehicle presence is required for 'systematic' hands-on testing .. Too many details easily get lost in transition over the Internet! .. (**)