Lean Burn Not Working with New O2 Sensors
Immediately after Honda replaced 2nd and 3rd O2 Sensors on my 178K 05 MT as part of used car purchase due to P0138 + P1130 codes, my 45 mile all freeway commute MPG dropped from 72 MPG to 60 MPG. I noticed it hardly goes into Lean Burn now on the freeway. Two months prior to this event, Honda completely serviced it as part of the purchase with new fluids, filters, spark plugs, valve adjustment, and cleaned the EGR. This one owner G1 had 64.8 lifetime MPG when I purchased it in late April with 176K and is stock with all the belly panels and clean CARFAX and VIN numbers on every panels including front and rear bumpers. In 2014 at 152K dealer put a Honda $2,200 IMA including tax which owner paid. IMA discharge/charge fine. It is airways at 19 bars, drops two bars when used and immediately puts it back. I have put Ethonal free gas and ran it in 3rd gear at 3,500+ RPM for 15+ minutes just in case CAT needed cleaning, no change getting LB at highway speed. It has been driven 1000 miles since and no change. Honda Service used the correct part number according to MajesticHonda parts catalog and OBDE doesn't show any codes. My local dealership is not familiar with G1's and is not much help. I need G1 community help. Thanks and hope to meet some of you at InsightFest 2017 in a few weeks. Steve
Last edited by AP1ZE1; 06-22-2017 at 09:41 PM.