Service bulletin 02-173-18

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.

The communication, as NHTSA indexes it (as of 2026-10-19)
Type	Service bulletin
NHTSA id	10140480
Published by NHTSA	2018-06-11
Manufacturer's number	02-173-18
Manufacturer's date	2018-02-06
NHTSA component	EQUIPMENT ADAPTIVE/MOBILITY; ENGINE AND ENGINE COOLING:ENGINE:GASOLINE:TURBO/SUPERCHARGER; ENGINE AND ENGINE COOLING:ENGINE:OTHER FUEL TYPES:TURBO/SUPERCHARGER

NHTSA's summary

2.0L Turbo Models only. This bulletin announces availability of a special turbocharger air intake duct designed to prevent EXTREMELY RARE occurrence of ice formation from condensation in the duct?s PCV system passages.

The document

The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.

Components

Engine, Equipment and accessories, Turbocharger or supercharger

Vehicles listed
SUBARU FORESTER	2014, 2015, 2016, 2017
SUBARU WRX	2015, 2016, 2017

Listing a model year does not mean every vehicle of it is concerned: the document says which.

Recalls for the same vehicles and component
16V162000	2016-03-21. ENGINE AND ENGINE COOLING:ENGINE:GASOLINE:TURBO/SUPERCHARGER

A recall listed here may apply to some of the same vehicles. Only the manufacturer can say whether it applies to one vehicle.

Other bulletins for the same vehicles and component
02-179-18	2018-12-10. Service bulletin. This Service Information Bulletin announces a change to the procedure and sequence used for torqueing the cylinder head bolts on the EJ25 turbocharged engine used in the 2015-2018MY STI.
02-179-18	2018-12-10. Service bulletin. This Service Information Bulletin announces a change to the procedure and sequence used for torqueing the cylinder head bolts on the EJ25 turbocharged engine used in the 2015-2018MY STI.
WTA-62SS	2018-06-11. Service bulletin. Subaru Safety Recall Campaign/ STOP SALE: WTA?62 Turbo Engine Air Intake Duct. The turbocharger air intake duct on affected vehicles may have been produced with incorrect material that is susceptible to cracking.
WTA-62A	2018-06-11. Service bulletin. Turbo models only. Service Procedure Bulletin. The repair procedure will involve inspecting and possibly replacing the turbocharger air intake duct. Inspection of the turbocharger air intake duct lot number (date) molded on the duct will be necessary to determine if replacement is required.
WTA-62	2018-06-11. Service bulletin. Turbo models only. Subject: Update ? Subaru Safety Recall Campaign/ STOP SALE: WTA?62 Turbo Engine Air Intake Duct. Owner Notification: All potentially affected vehicle owners will be notified by first class mail on or around April 15, 2016. As previously announced on March 17, 2016, Subaru of America, Inc. (Subaru) is recalling certain 2015 and 2016 model year Forester 2.0XT and WRX vehicles due to a possible issue with the turbocharger air intake duct.
02-173-18	2018-06-11. Service bulletin. 2.0L Turbo Models only. This bulletin announces availability of a special turbocharger air intake duct designed to prevent EXTREMELY RARE occurrences of ice formation from condensation in the duct?s PCV system passages.
11-169-16	2017-10-27. Service bulletin. Turbo models only. This bulletin announces the availability of reprogramming files to optimize the ECM. These new files will address customer concerns of: ? Spark knock (ping) during high intake air temperature operation ? Surge on acceleration due to phantom knock detection ? Check Engine light illumination resulting from DTC P2270 and / or DTC P2270 and / or P0137 being stored in the ECM memory.