winelight 0 Posted July 16, 2013 Share Posted July 16, 2013 I have "P0171 Fuel trim too lean (bank 1)".Inspection of the live data reads:MAF sensor reading - steady (I believe this means the MAF sensor is probably working OK and does not need cleaning?)O2 sensor reading - fluctuates between about 0.1V and 0.7V (I believe this is normal operation at idle)?So, I am stuck to know what to do next?1. Clean MAF sensor anyway (this seems to be a sensible idea, because it won't cost anything)2. Replace MAF sensor3. Replace inlet manifold gasket4. Replace O2 sensor5. Replace CAT convertor6. Something I haven't though of.Any suggestions please? Quote Link to post Share on other sites
winelight 0 Posted July 21, 2013 Author Share Posted July 21, 2013 OK, I cleaned the MAF sensor wires with carb cleaner and it solved that problem. Quote Link to post Share on other sites
Ash1502 1 Posted September 10, 2013 Share Posted September 10, 2013 where abouts is the maf sensor located. ive got a friends aygo with the exact same problem and fault code Quote Link to post Share on other sites
FROSTYBALLS 3,344 Posted September 10, 2013 Share Posted September 10, 2013 See http://www.toyotaownersclub.com/forums/topic/113628-aygo-maf-sensor/ Quote Link to post Share on other sites
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