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Service bulletins for the 2015 Subaru Legacy

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.

527 on file from NHTSA, as of 2026-10-19.

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Only bulletins with component: Engine are shown. Show all

Bulletins, newest first
02-134-12R2019-03-11. Service bulletin. ENGINE; EQUIPMENT. The purpose of this bulletin is to announce a change to the specification of the valve springs used in the FB engine. The new springs have different color paint marks to help identify their application.
07-133-182019-02-19. Service bulletin. ENGINE. This Service Information Bulletin announces design changes to the engine?s knock sensor which will help improve vehicle assembly line efficiency and increase durability. In some cases, the Check Engine light may illuminate and a knock sensor-related DTC set in the ECM memory: P0327, P0328, P0332 and P0333. The knock sensor for DIT engines is now utilized for NA engines to improve durability and resistance to heat.
02-177-182018-10-01. Service bulletin. EQUIPMENT; ENGINE. In conjunction with the launch of our new Remanufactured FB Engine Short Block Program, SOA would like to reinforce Core Return Policy (See Parts Policy & Procedures Manual ? Section 12.3 Core Returns ? Reman) and provide suggestions for removal and handling of the short block.
02-171-18R2018-08-20. Service bulletin. ENGINE; ENGINE AND ENGINE COOLING:COOLING SYSTEM; ENGINE AND ENGINE COOLING. This bulletin provides a service procedure for installation of additional foam packing to enhance performance of the Ambient Air Temperature Sensor. The additional foam better insulates the sensor from engine compartment heat which may lead to setting a DTC P0072. This information is applicable to models with or without the Active Grill Shutter (AGS) system.
02-160-152018-06-18. Service bulletin. ENGINE AND ENGINE COOLING. This Service Information bulletin provides revised procedures for inspection and measurement of the cylinder block assembly to determine whether or not replacement is necessary. Read through and understand this information completely before proceeding with any repairs to the cylinder block. All Models with FA and FB Engines, 2011MY and Later.
122565-1225502018-06-11. Service bulletin. ENGINE; EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL; ELECTRICAL SYSTEM:STARTER ASSEMBLY. Remote Engine Start Systems Trouble Shooting Guide
11-162-16R2018-06-11. Service bulletin. ELECTRICAL SYSTEM; ENGINE. Revised TSB. Reprogramming File Availability for Extended Engine Cranking (Delayed Starting) and Engine Oil Level Detection Improvement. This bulletin announces availability of reprogramming files to address customer concerns of extended cranking time before the engine starts. These files also optimize the ECM for improved engine oil level detection. Replacement of the oil level switch specified below is also required to complement the new logic.
11-145-14R2018-06-11. Service bulletin. ENGINE; ELECTRICAL SYSTEM; EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL. Revised TSB. This bulletin announces the availability of reprogramming files and a revised oil level switch to optimize the ECM logic for engine oil level detection in the event of false or premature low engine oil level warning lamp illumination. Should a customer present a concern with a low engine oil warning lamp illumination and the diagnosis indicate the oil level is full or nearly full (oil level between the full and add marks/holes on the dipstick) and the customer has not added any engine oil, the ECM must be updated with this new logic and the oil level switch specified below replaced. The new oil level switch part number supplied in this bulletin must be used. If the customer has added oil, determine how much was added. Based upon the information provided, estimate where the oil level was when the lamp illuminated in order to determine if additional action is required beyond what is described in this bulletin (e.g an oil consumption test). The ECM must still be updated with this new logic and the oil level switch replaced.
11-162-162018-06-11. Service bulletin. ENGINE; ELECTRICAL SYSTEM. Reprogramming File Availability for Extended Engine Cranking (Delayed Starting) and Engine Oil Level Detection Improvement. This bulletin announces availability of reprogramming files to address customer concerns of extended cranking time before the engine starts. These files also optimize the ECM for improved engine oil level detection. Replacement of the oil level switch is also required to complement the new logic.
02-170-172018-04-02. Service bulletin. ENGINE AND ENGINE COOLING. This bulletin announces part information for new Active Valve Control System (AVCS) oil control solenoid valves (OCV) which contain a redesigned internal oil seal. The new seal will eliminate potential oil seepage into the wire harness connector portion of the valve. If oil seeps into the connector, over time, the Check Engine lamp may illuminate and set various AVCS-related DTCs.
02-168-172017-09-14. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE:GASOLINE:BELTS AND ASSOCIATED PULLEYS; ENGINE. This Service Information bulletin announces a material change to the engine accessory drive / v-belt made to address customer concerns of a slipping belt (squeal or chirping) sound.
09-66-162017-08-14. Service bulletin. ENGINE AND ENGINE COOLING:EXHAUST SYSTEM; ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:MANIFOLD/HEADER/MUFFLER/TAIL PIPE. This bulletin announces a change in the production procedure for the rear muffler assembly. Spot-weld locations securing the outer shell portion have been changed to improve overall rigidity. A gap may develop at the spot welded seam as a result of repeated thermal shock (heating / cooling) which occurs during normal use. The gap does not create an exhaust leak. In some cases, a rattling sound from the muffler may develop.
02-164-162017-08-14. Service bulletin. ENGINE AND ENGINE COOLING. This Service Information bulletin announces a design change to the internal contact portion of the oil pressure switch to increase durability
07-89-15R2017-03-08. Service bulletin. EQUIPMENT:APPLIANCE:AIR CONDITIONER; ENGINE. IF YOU RECEIVE A CUSTOMER CONCERN OF A NO CRANK / NO START CONDITION DURING VERY COLD TEMPERATURES, THE IG1, IG2, ACC1, ACC2 AND/OR THE EGI MAIN RELAYS MAY BE THE ROOT CAUSE AND REQUIRE REPLACEMENT. IT IS GENERALLY REPORTED THAT THE CAR STARTS NORMALLY AFTER AN OVERNIGHT SOAK. AFTER THE INITIAL START, THE CUSTOMER DRIVES A SHORT DISTANCE THEN SHUTS THE CAR OFF (EXAMPLE: AT A GAS PUMP OR COFFEE SHOP). AFTER THE TIME THAT IT TAKES TO PUMP THEIR GAS OR GET THEIR COFFEE, THEY RETURN TO THE CAR AND IT WILL NOT START. THE CUSTOMER MAY ALSO NOTICE THE INSTRUMENT CLUSTER AND/OR INTERIOR LIGHTS ARE NOT ILLUMINATING ALONG WITH THE HVAC BEING INOPERATIVE. THE SOURCE OF THIS CONDITION HAS BEEN IDENTIFIED AS CONDENSATION FLASH-FREEZING INSIDE THE RELAYS. THIS BULLETIN PROVIDES A SERVICE PROCEDURE FOR REPLACEMENT OF ALL 5 RELAYS, 4 OF WHICH ARE LOCATED TOGETHER IN THE VEHICLE’S INTERIOR FUSE BOX (F/B) AND THE EGI MAIN RELAY WHICH IS LOCATED IN THE UNDER-HOOD MAIN FUSE BOX (M/B).
11-148-142017-03-02. Service bulletin. ENGINE; ELECTRICAL SYSTEM:SOFTWARE. REPROGRAMMING FILE AVAILABILITY FOR OIL LEVEL DETECTION
11-160-152017-02-27. Service bulletin. ELECTRICAL SYSTEM:SOFTWARE; ENGINE. THIS BULLETIN ANNOUNCES AVAILABILITY OF REPROGRAMMING FILES TO OPTIMIZE THE ECM FOR DTC P0137. THESE FILES WILL ALSO ADDRESS CUSTOMER CONCERNS OF ENGINE IDLE RPM DROP AFTER A HOT ENGINE RESTART ON 2.5L MODELS AND WHEN SHIFTING FROM REVERSE TO DRIVE AFTER A COLD START ON 3.6L MODELS.
02-162-152017-02-27. Service bulletin. ENGINE. "THIS SERVICE INFORMATION BULLETIN ANNOUNCES A DESIGN CHANGE TO THE OIL PRESSURE SWITCH ASSEMBLY. NICKEL PLATING HAS BEEN APPLIED TO THE INTERNAL SWITCH CONTACTS TO ENHANCE THEIR DURABILITY AND REDUCE THE POSSIBILITY OF POOR CONTACT WHICH COULD AFFECT OPERATION OR CAUSE IMPROPER ILLUMINATION OF THE OIL PRESSURE WARNING LAMP. A SMALL PILOT PORTION WAS ADDED TO THE THREADED AREA ON P.N. 25240KA051 AS SHOWN IN THE ILLUSTRATION BELOW."
09-59-14R2017-02-16. Service bulletin. ENGINE AND ENGINE COOLING:EXHAUST SYSTEM. THIS BULLETIN PROVIDES A TREATMENT PROCEDURE TO ADDRESS A CUSTOMER CONCERN OF RUST DEVELOPING ON THE FRONT EXHAUST PIPE HEAT SHIELD RETAINING BOLT HEADS AS SHOWN IN THE ILLUSTRATIONS BELOW.
16-99-162016-12-27. Service bulletin. VEHICLE SPEED CONTROL:CRUISE CONTROL; ENGINE. "THIS BULLETIN ANNOUNCES AVAILABILITY OF REPROGRAMMING FILES TO OPTIMIZE TRANSMISSION CONTROL MODULE (TCM) OPERATION AND ADDRESS THE FOLLOWING CUSTOMER CONCERNS: • ENGINE RPM “FLARE” (SHARP RPM INCREASE WHEN CVT “DOWNSHIFTS”) WHEN USING CRUISE CONTROL ON UPHILL GRADES • CANCELLATION OF CRUISE CONTROL AS A RESULT OF RPM FLARE (DRIVER MUST RESET DESIRED VEHICLE SPEED). THIS NEW LOGIC CHANGES THE CRUISE CONTROL SYSTEM OPERATION TO AVOID UNEXPECTED CANCELLATION. "
07-89-152016-11-02. Service bulletin. ENGINE. THIS BULLETIN PROVIDES A SERVICE PROCEDURE FOR REPLACEMENT OF THE 4 RELAYS, ALL OF WHICH ARE LOCATED TOGETHER IN THE VEHICLE’S INTERIOR FUSE BOX (F/B).
07-89-15R2016-09-28. Service bulletin. ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL; EQUIPMENT:APPLIANCE:AIR CONDITIONER; ENGINE. "IF YOU RECEIVE A CUSTOMER CONCERN OF A NO CRANK / NO START CONDITION DURING VERY COLD TEMPERATURES, THE IG1, IG2, ACC1, ACC2 AND/OR THE EGI MAIN RELAYS MAY BE THE ROOT CAUSE AND REQUIRE REPLACEMENT. IT IS GENERALLY REPORTED THAT THE CAR STARTS NORMALLY AFTER AN OVERNIGHT SOAK. AFTER THE INITIAL START, THE CUSTOMER DRIVES A SHORT DISTANCE THEN SHUTS THE CAR OFF (EXAMPLE: AT A GAS PUMP OR COFFEE SHOP). AFTER THE TIME THAT IT TAKES TO PUMP THEIR GAS OR GET THEIR COFFEE, THEY RETURN TO THE CAR AND IT WILL NOT START. THE CUSTOMER MAY ALSO NOTICE THE INSTRUMENT CLUSTER AND/OR INTERIOR LIGHTS ARE NOT ILLUMINATING ALONG WITH THE HVAC BEING INOPERATIVE. THE SOURCE OF THIS CONDITION HAS BEEN IDENTIFIED AS CONDENSATION FLASH-FREEZING INSIDE THE RELAYS. THIS BULLETIN PROVIDES A SERVICE PROCEDURE FOR REPLACEMENT OF ALL 5 RELAYS, 4 OF WHICH ARE LOCATED TOGETHER IN THE VEHICLE’S INTERIOR FUSE BOX (F/B) AND THE EGI MAIN RELAY WHICH IS LOCATED IN THE UNDER-HOOD MAIN FUSE BOX (M/B). "
11-155-152016-09-22. Service bulletin. ENGINE. THIS BULLETIN ANNOUNCES AVAILABILITY OF REPROGRAMMING FILES TO ADDRESS CUSTOMER CONCERNS OF EXTENDED CRANKING TIME BEFORE THE ENGINE STARTS. THESE FILES ALSO OPTIMIZE THE ECM FOR IMPROVED ENGINE OIL LEVEL DETECTION.
02-158-14R2016-09-20. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE:GASOLINE:BELTS AND ASSOCIATED PULLEYS. THIS SERVICE INFORMATION BULLETIN ANNOUNCES CHANGES TO THE COMPONENT PARTS OF THE ACCESSORY DRIVE BELT TENSIONER ASSEMBLY USED ON 3.6L H-6 ENGINES. THESE DESIGN CHANGES WILL INCREASE THE RIGIDITY OF THE TENSIONER ASSEMBLY WHILE IMPROVING PRODUCTION EFFICIENCY.
11-152-142016-06-02. Service bulletin. ENGINE AND ENGINE COOLING:COOLING SYSTEM:HOSES/LINES/PIPING/FITTINGS. SUMMARY TO BE PROVIDED ON A FUTURE DATE.
02-158-142016-06-02. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE:GASOLINE:BELTS AND ASSOCIATED PULLEYS. SUMMARY TO BE PROVIDED ON A FUTURE DATE.

The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.