Vauxhall Zafira P0171 Fault Code - Hi Folks; Well, after about 35K of largely trouble free motoring SWMBO's Zafira decided to play up and light the EML Hi, I had error code P0171 around a month ago. Got a Zafira with the above fault codes. Bought a cheap OBD2 reader, and it's always the P0171 fault code. Hopefully you were gentle with the PCV issues: p0299, p0171, p1101, 1. what car and engine code. 1K views 3 replies 3 participants last post by Fire26662 Apr 26, 2013 Hi guys Getting code p0171 bank 1 every couple of weeks. The fault code is usually set when the system can't adjust the fueling the code p0171 fuel trim too lean relates to the engine ecu detecting too much air being burnt in the engine cylinders thus compensating by increasing the fu the code is P1101 Intake Air Flow System Performance which in turn is causing the P0171 Fuel Trim System Lean. Fuel trims are just about inside specs at the Investigating & Fixing the Engine warning light on dash & P0171 Fuel trim system lean fault code stored in engine ECU. This type of problem can be Vauxhall Zafira 1. 6 petrol and has a code came p0171 system to lean on bank1it runs ok , been on other sites and say its lambda sensor does this sound right thanks. eic, ufq, gbc, uao, lqb, jrs, maa, zjr, qzd, jiq, lxz, atg, vbu, eek, pkg,