My highlander 2008 is showing P0171 and P0174, P1201, and shit to P range, what is the problem
P0171 & P0174 are lean codes and in most cases indicate a vacuum leak. Check all hoses for cracks. With the engine running, you can spray carb cleaner around suspected areas and if the idea increases, that is your culprit. A smoke test can also be performed with usually better results.
Lots of youtube videos on finding vacuum leaks, type in the 2 codes and you'll get tons of info. Start with these codes first, as the P1201 could be related.
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