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Service bulletin A18-027

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id10133022
Published by NHTSA2018-04-16
Manufacturer's numberA18-027
Manufacturer's date2018-03-16
NHTSA componentFUEL SYSTEM, GASOLINE:FUEL INJECTION SYSTEM

NHTSA's summary

Service bulletin - The MIL is on and DTC P0420 (catalyst system efficiency below threshold) is set. Faulty fuel injectors in one or more cylinders may be affecting combustion and causing a false DTC P0420.

The document

The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.

Components

Fuel system, Fuel injection

Trouble codes named

P0420

Vehicles listed
HONDA FIT2015, 2016

Listing a model year does not mean every vehicle of it is concerned: the document says which.

Other bulletins for the same vehicles and component
A22010A2022-01-19. Service bulletin. ServiceNews Article - When diagnosing a Fit within the above VIN range with a misfire complaint, start by doing service bulletin 21-007 (Carbon Buildup with Misfire DTCs) instead of replacing fuel injectors. These vehicles use an improved injector design that addresses the failures that may have occurred in previous model years. In fact, fuel injectors within the above VIN range with misfire complaints were collected and found to have no defects that required part replacement. Replacing those injectors may have reduced the number of misfires temporarily, but most likely didn't address the actual cause of the misfire. The recommended repair for these vehicles is to do the intake valve cleaning procedure described in service bulletin 21-007 (Carbon Buildup with Misfire DTCs).
A15-060 - 9-3-152017-06-19. Service bulletin. SERVICE BULLETIN - THE NOISE SUPPRESSION CAPACITORS INSIDE THE IGNITION COILS MAY DEGRADE OVER TIME CAUSING THE CHECK ENGINE LIGHT TO ILLUMINATE, THE ENGINE OR FUEL INJECTION SYSTEM TO MALFUNCTION, OR IN SEVERE CASES CAUSE THE ENGINE TO STALL.
A16-0342016-11-16. Service bulletin. SERVICE BULLETIN - THE IGNITION COIL, SPARK PLUG, OR FUEL INJECTOR ON ONE OR MORE CYLINDERS MAY BE AFFECTING COMBUSTION AND CAUSE THE ENGINE TO MISFIRE.