# Service bulletin B121515

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: 10147664
- Published by NHTSA: 2018\-11\-13
- Manufacturer's number: B121515
- Manufacturer's date: 2015\-03\-01
- NHTSA component: ENGINE

## NHTSA's summary

N55:Corrosion on Delphi Ignition Coil Outer Heat Shield. Signs of corrosion are found on an ignition coil\(s\) metal heat shield when replacing the spark plugs or performing an engine repair. On the N55 engine, moisture can enter the spark plug shafts due to the design of the cylinder head cover and ignition coil sealing cover. This can cause slight to moderate traces of corrosion to develop on the ignition coil metal heat shield; however, this will not have any impact on the function or performance of the ignition coil.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2015/MC-10147664-9999.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2015/MC-10147664-0001.pdf)

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

## Components

Engine

## Vehicles listed

- BMW BMW

JSON: [/v1/bulletins/10147664](/v1/bulletins/10147664)

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