When i took my car to the dealer for an oil change last month, the service tech told me they were going to check out and, if necessary, replace the rear springs on a recall for my 2014 subaru. How does a vacuum leak cause a p0171 code Listen and look around your subaru forester’s engine bay to see if you can find the vacuum leak
Subaru P0011 and P0021: Expert Q&A on XT Limited Outback | JustAnswer
Look at any hoses or sensors that connect to the intake.
If the p0171 is combined with the p0174 code, it's very likely that the problem is caused by an intake leak
If there are no intake leaks, the next step is to replace the. What does the p0171 system too lean (bank 1) mean P0171 code gets triggered when the engine control module receives an input signal from the oxygen sensor. This “system too lean” code means your engine’s getting too much air or not enough fuel, and if you keep driving like nothing’s wrong, you’re risking.
