# Service bulletin Circular 24FX

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: 10189154
- Published by NHTSA: 2021\-04\-06
- Manufacturer's number: Circular 24FX
- Manufacturer's date: 2021\-03\-12
- NHTSA component: ENGINE AND ENGINE COOLING

## NHTSA's summary

In the event of a catalytic converter failure, which could negatively impact tailpipe emissions, existing diagnostics may not properly illuminate the check engine light \(MIL\) due an error identified with Rear O2 Sensor monitoring. Additionally, under certain conditions, the engine may stall at low speeds \(such as while the vehicle is slowing down or coming to a stop\), or when the vehicle is already at a stop with the engine running.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2021/MC-10189154-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2021/MC-10189154-9999.pdf)

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

## Components

Engine

## Vehicles listed

- 2019 to 2021 VOLKSWAGEN GTI
- 2019 to 2021 VOLKSWAGEN JETTA

## Other bulletins for the same vehicles and component

- [V0116152014815\_20](/bulletins/11038146.md), 2026-10-06, Service bulletin: ENGINE. Suggested fuel additive
- [V1718062017813\_24](/bulletins/11035762.md), 2026-08-05, Service bulletin: ENGINE. Oil Consumption Measurement and Electronic Oil Consumption Measurement
- [V1719012012855\_81](/bulletins/11034617.md), 2026-07-07, Service bulletin: ENGINE. Volkswagen Engine Oil Standards
- [TT 13\-20\-01\_3](/bulletins/11034614.md), 2026-07-07, Service bulletin: ENGINE. Instruction, how to lubicate engine before initial start.
- [TT 10\-18\-02\_2](/bulletins/11034613.md), 2026-07-07, Service bulletin: ENGINE. Lubricating engine components before reassembly.
- [VOS\-26\-21](/bulletins/11030847.md), 2026-04-06, Service bulletin: ENGINE. This is a notice for software changes with the ODIS diagnostic program to correct the communication during vehicle programming function: A software fix is needed to correct the error message ERP0204E could occur during perform initial operation, software configuration, SVM updates for any control module\(s\) etc.
- [WLA\-25\-11](/bulletins/11025452.md), 2025-11-10, Service bulletin: ENGINE. Coolant Bleed Procedure
- [V2125012077512\_2](/bulletins/11025438.md), 2025-11-10, Service bulletin: ENGINE. Turbocharger repair or replace due to stuck wastegate.
- [V1917012022548\_15](/bulletins/11025437.md), 2025-11-10, Service bulletin: ENGINE. G12Evo can now be mixed with previous coolants.
- [V1718062017813\_23](/bulletins/11025436.md), 2025-11-10, Service bulletin: ENGINE. How to measure engine oil consumption.

JSON: [/v1/bulletins/10189154](/v1/bulletins/10189154)

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