1999 Toyota camry
, v6 p0171. No vacuum leaks found. Front bank running rich, rear bank running lean, swapped af sensors, with known good ones, still there. replaced plugs, how I know whats rich or lean. Erractic misfire, random. compression good, disconnected egr, still the same. erased code, comes back immediately whether driven or not, Block checked system for possible head issue, none found.
JA: Do you have a scan tool to read the codes?
Customer: Just a cheap mac read only scanner, no verus or other handy.
JA: Are you fixing your Camry yourself? What have you tried so far?
Customer: installed 4 new af sensors, but did get them on ebay, Don't want to have to pay 150 to 200 each from denso. Trying to narrow it down, short and long term fuel way out of specs. Oil was changed so that there is no contamination.
JA: Anything else you want the mechanic to know before I connect you?
Customer: Car runs pretty good, 234k miles. Only shows code po171, bank 1 running lean. If it was fuel pressure it would be both banks, also if it was the maf wouldn't it relate to both. New hoses to throttle body intake