× Auto Repair Pros Member Benefits TechHelp Knowledge Base Forums Resources My iATN Marketplace Chat Pricing About Us Join Industry Sponsors Video Members Only Repair Shops Auto Pro Careers Auto Pro Reviews
Join Now
International Automotive Technicians Network

P0172 Diagnostic Trouble Code Discussion for November 2021

Fuel System Rich (Bank 1)

Note: This is a professional automotive technician's resource.
Vehicle Owners: If you are seeking an automotive repair professional to service your vehicle, visit the iATN Repair Shop Finder.

Trouble Ticket Help Requests for DTC P0172
Help Request Posted
2016 Ford Fusion SE 1.5L MIL Lamp on VIN: 1FA6P0HD1G
P0172: Bank one system rich. ... Customer complaint was the CEL was on. Tech pulled a P0172 - bank one system rich. I had him monitor the fuel trims. He states they are short & long term are at negative 25 at idle. Under mild acceleration they go to around 2.3. At cruise there bet...
November 01, 2021
1996 Ford Bronco Eddie Bauer 5.8L Excessive Emissions, Stall VIN: 1FMEU15H8T
P0172: system to rich bank 1. This one is kicking my butt. Customer states check engine light comes on and sometimes turns off. Connected the scan tool and found LTFT both banks at -25%. STFT were hovering around 0, +/- 5. I checked fuel pressure and found it was good at about 32-38psi...
November 15, 2021
2008 Chevrolet Silverado 1500 WT 4.3L Poor Idle Quality, Stall VIN: 1GCEC14X48
P0172: Rich bank 1. Have this truck that both st fuel trims reach -15 to -20 at idle. Cleaned t-body, ck fuel press(ok), replaced maf old maf pids looked good. On cold start is hard to start but will start up with slight throttle applied. Iat pids bounce from -4 to actual tem...
November 24, 2021