P0171 (P026C-00) In Sport Mode - Jeep Garage - Jeep Forum

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Old 08-06-2016, 08:38 PM
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P0171 (P026C-00) In Sport Mode

Wanted to share my experience, hope it helps others

Had a MIL show up a few months ago when I would drive around in sport mode: P0171-00 System Too Lean (Bank 1) [Now becomes "P026C-00 Fuel Injection Quantity Lower Than Expected" in newer PCM software] I hadn't noticed anything out of the ordinary, the engine didn't seem to be starving for fuel, and it had less than 17k miles on it. No big differences between commanded and actual fuel rail pressure PIDs either. Brought it to the dealer first just in case this was another software bug. This time, it wasn't. They had some other updates to do, but their solution for the MIL was to change the fuel filters and consider pulling the fuel injectors. They described the filters as being "completely black", and cited similar STAR cases in their service summary.

Instead, I ordered my own MOPAR filters from eBay (http://r.ebay.com/XWZXhV), and did the service myself at an upcoming oil change. The dealer wasn't kidding! Even after replacing the filters and clearing the code, it returned. I started a regimen of Amsoil Fuel System cleaner for 2 tankfuls in the hope of avoiding injector work. 50 gallons of fuel later, no more codes. Things I've learned:
  • Fuel injection measurement system is more sensitive than I am
  • MOPAR fuel filters won't block all the crud
  • Make better gas station choices
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