# Service bulletin A21\-007

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: 10237806
- Published by NHTSA: 2023\-06\-15
- Manufacturer's number: A21\-007
- Manufacturer's date: 2023\-06\-02
- NHTSA component: ENGINE AND ENGINE COOLING

## NHTSA's summary

Service Bulletin \- The MIL comes on with DTC P0300 \(random misfire detected\) or P0301–P0304 \(cylinder misfire detected\) due to carbon buildup on the intake valves may be affecting combustion.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2023/MC-10237806-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2023/MC-10237806-9999.pdf)

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

## Components

Engine

## Trouble codes named

P0300, P0301, P0304

## Vehicles listed

- 2016 to 2020 HONDA FIT

## Other bulletins for the same vehicles and component

- [ATI\&03072025901](/bulletins/11015694.md), 2025-03-19, Other: ENGINE. Dealer Message \- American Honda Motor Co., Inc. \(AHM\) is searching for certain 2017 Fits with customer complaint of Check Engine Light \(CEL\) on with DTC P0420 \[Catalyst System Effciency Below Threshold\] stored. To better understand the cause of this condition, AHM would like to specific parts from the vehicle prior to you attempting a repair of any kind.
- [ATI\&02212025901](/bulletins/11015010.md), 2025-03-05, Other: ENGINE. Dealer Message \- American Honda Motor Co., Inc. \(AHM\) is searching for certain 2017 Fits with customer complaint of Check Engine Light \(CEL\) on with DTC P0420 \[Catalyst System Effciency Below Threshold\] stored. To better understand the cause of this condition, AHM would like to specific parts from the vehicle prior to you attempting a repair of any kind.
- [ATI\&02072025901](/bulletins/11014324.md), 2025-02-18, Other: ENGINE. Dealer Message \- American Honda Motor Co., Inc. \(AHM\) is searching for certain 2017 Fits with customer complaint of Check Engine Light \(CEL\) on with DTC P0420 \[Catalyst System Effciency Below Threshold\] stored. To better understand the cause of this condition, AHM would like to specific parts from the vehicle prior to you attempting a repair of any kind.
- [ATI\&01082025901](/bulletins/11013099.md), 2025-01-25, Other: ENGINE. Dealer Message \- American Honda Motor Co., Inc. \(AHM\) is searching for certain 2017 Fits with customer complaint of Check Engine Light \(CEL\) on with DTC P0420 \[Catalyst System Effciency Below Threshold\] stored. To better understand the cause of this condition, AHM would like to specific parts from the vehicle prior to you attempting a repair of any kind.
- [ATI\&12022024909](/bulletins/11011792.md), 2024-12-12, Other: ENGINE. Dealer Message \- American Honda Motor Co., Inc. \(AHM\) is searching for certain 2018\-2024 Accord 1.5Ls, 2021\-2024 Civics 1.5Ls, 2023\-2024 CR\-Vs 1.5Ls, and 2017 Fits with customer complaint of Check Engine Light \(CEL\) on with DTC P0420 \[Catalyst System Efficiency Below Threshold\] stored. To better understand the cause of this condition, AHM would like to specific parts from the vehicle prior to you attempting a repair of any kind.
- [ATI\&11052024902](/bulletins/11010549.md), 2024-11-14, Other: ENGINE. Dealer Message \- American Honda Motor Co., Inc. \(AHM\) is searching for certain 2018\-2024 Accord 1.5Ls, 2021\-2024 Civics 1.5Ls, 2023\-2024 CR\-Vs 1.5Ls, and 2017 Fits with customer complaint of Check Engine Light \(CEL\) on with DTC P0420 \[Catalyst System Effciency Below Threshold\] stored. To better understand the cause of this condition, AHM would like to specific parts from the vehicle prior to you attempting a repair of any kind.
- [ATI\&10232024907](/bulletins/11010116.md), 2024-11-06, Other: ENGINE. Dealer Message \- American Honda Motor Co., Inc. \(AHM\) is searching for certain 2017 Fits with customer complaint of Check Engine Light \(CEL\) on with DTC P0420 \[Catalyst System Effciency Below Threshold\] stored. To better understand the cause of this condition, AHM would like to specific parts from the vehicle prior to you attempting a repair of any kind.
- [ATI\&10022024908](/bulletins/11009181.md), 2024-10-25, Other: ENGINE. Dealer Message \- American Honda Motor Co., Inc. \(AHM\) is searching for certain 2017 Fits with customer complaint of Check Engine Light \(CEL\) on with DTC P0420 \[Catalyst System Effciency Below Threshold\] stored. To better understand the cause of this condition, AHM would like to specific parts from the vehicle prior to you attempting a repair of any kind.
- [ATI\&09162024905](/bulletins/11008049.md), 2024-09-26, Other: ENGINE. Dealer Message \- American Honda Motor Co., Inc. \(AHM\) is searching for certain 2017 Fits with customer complaint of Check Engine Light \(CEL\) on with DTC P0420 \[Catalyst System Effciency Below Threshold\] stored. To better understand the cause of this condition, AHM would like to specific parts from the vehicle prior to you attempting a repair of any kind.
- [ATI\&05032024905](/bulletins/11000132.md), 2024-05-15, Other: ENGINE. Dealer Message \- American Honda Motor Co., Inc. \(AHM\) is searching for certain 2018 Fits with customer complaint of Check Engine Light \(CEL\) on with DTC P0420 \[Catalyst System Efficiency Below Threshold\] stored. To better understand the cause of this condition, AHM would like to inspect the vehicle prior to your attempting a repair of any kind.

JSON: [/v1/bulletins/10237806](/v1/bulletins/10237806)

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