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Old 05-26-2013, 03:17 PM
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Keith Keith is offline
Rising Sun Member
Join Date: Jan 2013
Location: Lyons, CO
Posts: 297
Default "System too lean on bank 1" on 99 4Runner

Hey folks. Thought I'd run this by the experts here....

The Check Engine light on my girlfriends '99 4Runner came on 2 days ago. It has not had any driveability problems and seems to still be running just fine. We took it to NAPA and had them read the code and got "System too lean on bank 1".

So, per the recommendations of the folks at NAPA, we put in a can of fuel injector cleaner, and will fill it up with premium next time we fill it up. A web search seems to indicate we might also want to clean or replace the Mass Air Flow (MAF) sensor. So, I'll take a look at that in the next couple days.

Anyone here have any other thoughts on what we should do, or just do those and don't worry about it as long as the light doesn't come back on?

05 Double Cab Tacoma
64 FJ40
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