Question

1998 Honda CRV 2.0L with engine code P0171 and overconsumption of gas

Answer 1

P0171 Fuel trim lean bank 1

Vacuum leaks are mostly the main cause of a lean trim fuel condition, such as an open PCV valve or even a PCV hose that is ruptured, having a lean condition can increase the RPM of the engine, checking for vacuum leaks should be the first inspection

 

Spark plugs should also be checked, here a set of spark plugs installed in this Honda created a P0171 without an engine misfire code condition, what happened was all 4 spark plugs were not properly torqued down, being loose did not allow proper sealing during compression and intake stroke,

Answer 2

P0171 HONDA Code - Fuel Injection System Too Lean Bank 1
Read more: https://www.autocodes.com/p0171_honda.html