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When I start my sonic at idle is says; FUEL SYS1 - OL-FAULT then after a while LONGFT1 -25.9 SHRTFt1 - 0.0 No Codes except I still get P0304 misfire on Cyl4 after a while. Cleared and fixed many codes now; Valve Cover O2 Sensor Thermostat and Housing Fuel Pump Ignition Coil Purge Valve

Chevy Sonic. 2013. Was pulling a thermostat code P0597 P0598. i changed out the tstat and housing and hoses. engine light is now off! :) When I hook up the code reader, it says 0 Codes Present. But under stored and pending they still show??? I did erase codes. still there. Any thoughts?

2013 Chevy Sonic LT Hatch only 99,000 miles Car died one day while driving. engine light blinking. replaced ignition coil and spark plugs. got it running. dealer replaced fuel pump. but still rough. said would need to investigate misfiring. quoted and suggested oxygen sensor and t-stat. ran...

2013 Chevy Sonic LT Hatch only 99,000 miles :( Car died one day while driving. engine light blinking. replaced ignition coil and spark plugs. got it running. dealer replaced fuel pump. but still rough. said would need to investigate misfiring. quoted and suggested oxygen sensor and t-stat...