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0171....System too Lean (Bank 1) Sorry would need make and model to help any further ,i can only suggest you change the lamba sensor but what one and how many cylinders ect
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Since a P0171 can cause a P0420, you'd want to diagnose and fix the cause of the P0171 first. Here's an article on what to check when you have a P0171 https://ricksfreeautorepairadvice.com/fix-p0171-system-too-lean-trouble-code/
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https://www.youtube.com/watch?v=kZsqEfP-5zM
Jan 18, 2011 - Uploaded by realfixesrealfast
These two codes mean a V style engine is running lean on both banks. So you have to be thinking - what can ...
? 26:31
https://www.youtube.com/watch?v=Y8FBGrCT3rM
Nov 27, 2014 - Uploaded by Peter Finn
How to repair and fix fault or error code P0171 and reset warning light Toyota Corolla VVT-i engine. ... Also how to find fault codeusing OBD scanner. ... Trouble shooting a misfire, Code P0300, P0301, P0302, P0303, P0304, P0305, P0306, ... 2000 Toyota Corolla, P0171 & P0420 codes - Duration: 5:43. by ...
the P0171 is a lean condition that can be caused by several things, usually a vacuum leak, or plugged fuel filter, weak fuel pump, or restricted injector.
Does the truck lack power? what engine size is it? 5.4L or 6.8L?
p0171 is a condition based code, changing an o2 sensor will not necessarily fix this concern. it is just reporting more oxygen in the exhaust than it should be.
Determining exactly what of the thousands of parts on a modern car is broken is as difficult as doing the repairs many times. IN this video you'll learn how to diagnose and fix error codes P0171 and P0174 on a 2001 Ford Escape, which indicate vacuum problems.http://www.lightdeal.co.uk/
This is either a vacuum line or clogged EGR valve. This is the first thing to fix. Other problem is intake manifold.Cleaning will usually fix it, but change the gaskets and change isolator bolts.
what are the new codes clearing / resetting doesnt fix the problem the p0171 code has about ten different causes just changing or cleaning the sensor may not have been your problem P0171 System Too Lean Bank 1 rescan and get all codes then look up each one most sites have causes and solutions for obd ll trouble codes
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