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questions

WHANE START INGIN.

hello! couldnt find my car in "tell us your car"... so... i have a Vauxhall astra 2008 Z16LET, with following errors: P0141 0D and P0141 02 . I measured o2 sensors value with engine running: bank 1 sensor 1 voltage varies between 450 and 800 mv, and Bank 1 Sensor 2 varies over 1100 mv - 1250... and air/fuel rapport is poor for both sensors.... what can cause this errors?? thanks !