# Service bulletin B121615

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: 10147665
- Published by NHTSA: 2018\-11\-13
- Manufacturer's number: B121615
- Manufacturer's date: 2015\-03\-01
- NHTSA component: ENGINE; ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL:CATALYTIC CONVERTOR

## NHTSA's summary

N63T: Oxygen Sensor Internal Resistance Faults. The Service Engine Soon light comes on with either or both of the following faults stored in the DME memory: ? 12B701 \- Oxygen sensor heating after catalytic converter, function: Internal resistance too high ? 12B801 \- Oxygen sensor heating after catalytic converter 2, function: Internal resistance too high The engine operation and performance are not affected. The DME diagnosis for the post catalyst oxygen sensor\(s\) is too sensitive.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2015/MC-10147665-9999.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2015/MC-10147665-0001.pdf)

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

## Components

Engine, Exhaust and emissions, Catalytic converter

## Vehicles listed

- 2011 to 2013 BMW 1 SERIES M
- 2014 BMW 525D XDRIVE
- 2011 to 2016 BMW 550I
- 2010 to 2012 BMW 550I GRAN TURISMO
- 2012 to 2016 BMW 650I
- 2009 to 2015 BMW 750I
- 2009 to 2015 BMW 750LI
- 2012 BMW ACTIVE HYBRID 7
- 2014 BMW ACTIVE HYBRID 7
- 2011 BMW ACTIVEHYBRID 7
- 2014 to 2016 BMW X5

## Other bulletins for the same vehicles and component

- [B122319](/bulletins/10163995.md), 2019-08-19, Service bulletin: EQUIPMENT ADAPTIVE/MOBILITY; ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL:CATALYTIC CONVERTOR; EQUIPMENT:ELECTRICAL. DIAGNOSTIC HINT: CATALYTIC CONVERTER INSPECTION AFTER LOSS OF CRANKSHAFT SIGNAL. In certain situations when the crankshaft position signal is lost while driving the malfunction indicator lamp \(MIL\) and an engine malfunction check control message \(CCM \#29\) may be displayed. The engine may run roughly or with reduced power.

JSON: [/v1/bulletins/10147665](/v1/bulletins/10147665)

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