# Service bulletin SS731\-WST2022

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: 10222241
- Published by NHTSA: 2022\-10\-04
- Manufacturer's number: SS731\-WST2022
- Manufacturer's date: 2022\-09\-28
- NHTSA component: EQUIPMENT

## NHTSA's summary

Service Solution for Calendar Year 2022 Espar D2 and D4 Heater Shortages. Eberspacher has experienced ongoing shortages of the microprocessor that is used in the controller board for many different Espar heaters, including the D2 and D4 Airtronic heaters used in 49X.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2022/MC-10222241-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2022/MC-10222241-9999.pdf)

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

## Components

Equipment and accessories

## Vehicles listed

- 2023 WESTERN STAR 49X

JSON: [/v1/bulletins/10222241](/v1/bulletins/10222241)

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