What else could explain it?
Keep accompanying codes, engine concerns, leak findings and sensor results in view. A bulletin match does not exclude them.
Compare the starting evidence →2014–2015 Civic Hybrid · KA / KL source distinction
P0420? Check the software history
before a converter decision.
Honda documented a possible catalyst misinterpretation in this Civic Hybrid application. That makes the engine-control software history worth checking. It does not prove the converter is good—or that an update will fix your car.
Honda 22-045 · version 1 · 21 October 2022 ↗2014–2015 Hybrid only · current applicability unverified
WHAT DO YOU NEED TO UNDERSTAND?
YOUR NEXT DECISION
Before a converter decision, check the software history.
A possible software interpretation issue is different from a proven hardware failure.
Ask whether the installed PGM-FI program and exact application were compared with current Honda information.
Continue with this question →
Reading context only; no finding is added.
Does the original Civic Hybrid row fit?
Use existing vehicle and service records. KA and KL are Honda emission-code rows in this source; registration location alone is not enough. Keep an unknown code unknown. No VIN entry is needed.
Application details remain unknown.
Take one useful question to the repair discussion
Which installed PGM-FI program and exact emission-code application were reviewed?
Sources, revision limits and missing authority
Honda 22-045, version 1, 21 October 2022, pages 1–2. Rechecked 28 October 2026. Current applicability or absence of supersession has not been established. Its normal-warranty statement is not a recall, extension or promise of free work now.
This is original GoTech interpretation with links to manufacturer material. Public hosting does not grant permission to reproduce Honda’s procedure or images. Exact current instructions, equipment, actual-vehicle fitment, qualified review and physical/customer validation remain open.
Original Honda bulletin ↗