# 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.

- Type: Service bulletin
- NHTSA id: 10133022
- Published by NHTSA: 2018\-04\-16
- Manufacturer's number: A18\-027
- Manufacturer's date: 2018\-03\-16
- NHTSA component: FUEL 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

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2018/MC-10133022-9999.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2018/MC-10133022-0001.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Fuel system, Fuel injection

## Trouble codes named

P0420

## Vehicles listed

- 2015 to 2016 HONDA FIT

## Other bulletins for the same vehicles and component

- [A22010A](/bulletins/10206648.md), 2022-01-19, Service bulletin: ENGINE AND ENGINE COOLING; FUEL SYSTEM, GASOLINE:FUEL INJECTION SYSTEM. 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\-15](/bulletins/10107004.md), 2017-06-19, Service bulletin: ENGINE; FUEL SYSTEM, GASOLINE:FUEL INJECTION SYSTEM. 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\-034](/bulletins/10084296.md), 2016-11-16, Service bulletin: ENGINE; FUEL SYSTEM, GASOLINE:FUEL INJECTION SYSTEM:INJECTORS. 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.

JSON: [/v1/bulletins/10133022](/v1/bulletins/10133022)

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