P0171 Code – Causes, How To Diagnose and Fix

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In this short video we will talk about the common P0171 code symptoms, causes and show you how to diagnose and fix this issue.

Timecode:
00:00:00 - Short intro
00:00:40 - P0171 Symptoms
00:01:01 - P0171 Causes
00:01:27 - How to diagnose?

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  1. car PROblems
  2. car reliability
  3. common problems
  4. p0171 code
  5. p0171
  6. p0171 toyota
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Комментарии
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This is a good video but one somewhat common cause that was not addressed is the fuel injectors. I went for three years trying to figure out the P0171 code on my 2000 Corolla. LTFT was coming in at 38%. I had changed the fuel cap, PCV valve, 02 sensor, MAF sensor, air intake gasket, and ECU in addition to looking for vacuum leaks all to no avail. The fuel injectors were up next and they were found to have cracks in the casings. I applied super glue and put on fresh rings and filter baskets. I also sprayed them with MAF sensor cleaner. LTFT went from 38% to 19.5%. This is still high but this is below the threshold of P0171 triggering. I plan to put in new injectors at some point to hopefully further lower LTFT but in the interim the originals will do.

MrRusell
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Throttle body sensor can also cause a lean condition leading to misfires, trouble starting, stalling, very rough idle, hesitation while accerlating, jerky acceleration and false rpms.

lewisvenable
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Gonna check that right now, thanks for the tip👍

gbqbluz
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oil in spark plug 1 chamber will also cause this.

nyworldrl