Hello I have a 89 tbird sc 5spd scanned car got code 34c insufficient egr flow or evp voltage high(SONIC)or PFE sensor voltage high or out of spec also code 41c HEGO(HO2S) sensor signal out of range/always lean or No HO2S switching detected what does that mean bad egr valve I replaced both 02 sensor too any input apreciated thanks .
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