This Bulletin provides the diagnostic procedure for the STARLINK® Remote Engine Start (RES).
full bulletin at NHTSA ↗2006 Subaru Outback engine problems
moderate 23 complaints filed with NHTSA · avg repair $3,100 · see engine across all vehicles →
Failure mileage
Complaints
23
Recalls
0
Avg fix
$3,100
When does it fail?
Of the 23 engine complaints filed for the 2006 Subaru Outback, here's the actual mileage breakdown — failures cluster heaviest at 100,000-125,000 mi.
0-25k
25-50k
50-75k
75-100k
100-125k
125-150k
150k+
Each bar shows the share of total complaints filed at that mileage range. Peak failure window highlighted. Some owners report problems earlier; some make it well past 150,000 miles symptom-free. Maintenance habits and driving conditions shift the curve as much as mileage alone.
What stands out
No new NHTSA engine complaint has been filed on this vehicle in over 11 years — the issue may be aging out of the active population.
Is there a fix? Manufacturer service bulletins
The manufacturer has issued service bulletins covering engine on this vehicle — documented repair instructions, service campaigns, or warranty extensions sent to dealers. A TSB isn't a recall (it's not a free safety remedy), but it's the manufacturer acknowledging the issue and how to fix it.
This Service Information Bulletin provides the Service Manual Correction to the diagnostic procedure for DTC B2A16 (Immobilizer Key Collation Diagnosis).
full bulletin at NHTSA ↗This Bulletin announces the diagnostic procedures to be followed when diagnosing engine oil leakage on FA and FB type engines.
full bulletin at NHTSA ↗The purpose of this bulletin is to advise of SOA’s revised Catalytic Converter Recycling Program shipping procedure.
full bulletin at NHTSA ↗This bulletin contains additional information for recommended materials listed in the Service Manuals for individual models.
full bulletin at NHTSA ↗Source: NHTSA manufacturer communications. Bring the bulletin number to your dealer or shop.
The failure pattern owners describe
Owners report five distinct engine failures in 23 complaints:
Head gaskets blow without warning, often causing overheating, loud knocking, stalling, and loss of power steering. One owner had the engine replaced under warranty (~$8,000) in 2011; the replacement engine's head gaskets blew again in 2014 at only 30,000 miles with regular maintenance. Another bought the vehicle at 86,000 miles; the dealer replaced a leaking head gasket at 90,896 miles, then the engine began knocking badly, requiring full replacement. Owners describe this as a known, widespread defect in the 2.5L engine.
Throttle response fails without warning while driving 25–70 mph: the gas pedal stops working, the engine drops to idle (2,000–3,000 RPM), and the vehicle stalls or enters limp-home mode. Check engine and cruise control lights come on. After restarting, power returns but lights stay lit. One owner at highway speed barely made it to 20–30 mph before pulling off. Owners trace the problem to the throttle-by-wire system and pedal position sensor; some diagnoses point to code P2138 (Accelerator Pedal Position Sensor). The failure is intermittent and often clears after restart, making dealer diagnosis difficult.
Piston rings fail, allowing oil past and dropping compression to 30%. One owner describes this as a metallurgical defect, not catastrophic failure, affecting 2005–2006 models.
Turbo fails catastrophically on XT models, restricting power to under 30 mph and posing fire risk; one repair bill reached $6,508.
Throttle stuck open has occurred, causing unintended acceleration that drivers cannot control with pedal input.
Same Subaru Outback engine reports on nearby years: 2005 · 2007 · 2008 · 2009
Failure modes owners describe
Head Gasket Failure
Blown or failed head gaskets causing loss of engine sealing, oil leakage, overheating, and engine damage. Owners report this as a known, recurring issue across 2.5L engine models.
When: 78,063 miles; also reported at 90,896 miles (after purchase); 2011 failure with engine replaced, then recurred in 2014 with replacement engine at 30,000 miles
Symptoms owners cite: Oil leaks/smelling of oil; Temperature gauge spike into red zone; Loud, upsetting engine sounds; Loss of power steering; Engine stalling; Blown head gaskets confirmed on inspection; Cracked engine block (in one case)
Repairs/costs cited: Replacement head gaskets; one owner paid for timing belt replacement at same visit; full engine replacement approximately $8,000 under warranty (first failure); second engine failure not initially covered
Recalls/TSBs owners mention: One owner reported situation being reviewed by Subaru of America regarding coverage; dealers disputed causes (overfilled oil, running without oil); no recall issued
Throttle-by-Wire/Pedal Position Sensor Failure
Loss of throttle response and acceleration control, with engine going to idle or stalling. Electrical throttle system fails to respond to pedal input; check engine light and cruise control light illuminate. Issues traced to throttle assembly and throttle pedal position sensor.
When: 45,000 miles; 49,731 miles; 68,000 miles; 110,000 miles; 127,000 miles; 132,000 miles; 140,000 miles
Symptoms owners cite: Complete loss of acceleration/throttle response; Engine drops to low RPM (idle, 2,000–3,000 RPM); Check engine light illuminates; Cruise control light flashes; Rough idle at ~2,000 RPM; Vehicle stalls or enters limp-home mode; No warning before failure occurs; Problem intermittent; disappears after restart
Codes mentioned: P2138 (Accelerator Pedal Position Sensor)
Repairs/costs cited: Throttle assembly replacement needed (per independent mechanic diagnosis); repairs often not completed by dealership; many owners unable to get dealer or mechanic diagnosis due to intermittent nature
Recalls/TSBs owners mention: No recalls or TSBs mentioned; dealers unable to replicate or diagnose; one manufacturer notification made but no response documented
Piston Ring/Ringland Failure
Piston rings fail, allowing oil to escape past rings and reducing compression. Owner explicitly states this is a known defect affecting 2005–2006 Subaru models, describing it as a metallurgical defect rather than catastrophic failure.
When: Unknown mileage; owner notes vehicle serviced meticulously and driven gently
Symptoms owners cite: Misfires; Loss of oil; Loss of power; Reduced compression (down to 30% in one case)
Repairs/costs cited: Stock ringland replacement required; owner expresses frustration that no other car manufacturer has this recurring issue
Recalls/TSBs owners mention: No recall or warranty coverage; owner criticizes Subaru for not acknowledging the defect in 2005–2006 models
Turbo Failure (2006 XT model)
Turbocharger catastrophic failure, resulting in severely restricted power output and potential fire risk.
When: Unknown mileage
Symptoms owners cite: Unable to accelerate above 30 MPH; Potential for car fire
Repairs/costs cited: Turbo repair cost $6,508; dealer confirmed machined surfaces and engine bearings in excellent condition, suggesting turbo defect
Recalls/TSBs owners mention: Consumer dispute noted; no warranty coverage details; dealer did not acknowledge defect
Throttle Stuck Open
Throttle valve sticks in open position, causing unintended acceleration. Gas pedal input has no effect; vehicle accelerates on its own.
When: Unknown mileage
Symptoms owners cite: Throttle sticks open at ~2,500 RPM; Unintended acceleration from dead stop; Gas pedal unresponsive; Check engine light solid; Cruise control light flashes
Repairs/costs cited: Not repaired; owner had to apply brakes and move vehicle off road
Synthesized from 23 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 2 most recent
Driving along - check engine light comes on and cruise control light flashes. I immediately lose acceleration - need to pull over (thank god I was not on a major highway when this accurs). Have to turn car off - wait a few minutes and then restart. Lights still stay on but acceleration is normal. I have seen many different reason codes for this problem - I am now taking to my personal mechanic to…
Tl* the contact owns a 2006 Subaru outback. The contact stated that while driving at 40 MPH, the engine rpms increased. In addition, the check engine and the cruise control warning lights illuminated. The vehicle was taken to the dealer where it was diagnosed that the throttle pedal position sensor needed to be replaced. The vehicle was not repaired. The manufacturer was made aware of the…
Had engine trouble with your 2006 Subaru Outback?
File a complaint with NHTSA → It's free, official, and how every report above got here — owner filings are the federal safety record this page is built on.
Common questions
How serious is the engine problem on the 2006 Subaru Outback?
It's a documented issue but not catastrophic. 23 complaints have been filed. Repairs average $3,100 and most owners catch it before it causes a breakdown.
At what mileage does the engine typically fail?
Across the 21 complaints that reported odometer mileage, most engine failures cluster between 81,000 and 127,800 miles, with the median around 104,000. A quarter of owners report trouble before 81,000; a quarter make it past 127,800. Maintenance history matters more than the odometer alone — this is the reported failure window, not a guarantee.
What does it cost to fix?
Independent shops typically charge around $3,100 for engine repairs on this vehicle. Dealer pricing tends to run 20-40% higher. The exact figure depends on the specific failure mode, parts availability, and your local labor rates. If you're outside factory warranty, an extended service contract often covers this category.
Are there any recalls related to engine?
No active recalls currently cover engine issues on this vehicle. The complaints filed represent owner-reported failures that haven't risen to the level of a manufacturer-issued recall — but they're still worth knowing about before you buy or budget for repairs.
Related
Complaint and recall data sourced from the National Highway Traffic Safety Administration (NHTSA)
public records database. Verify the raw federal record at
nhtsa.gov/vehicle/2006/Subaru/Outback.
Severity ratings are derived from reported crashes, fires, injuries, and fatalities. Repair cost estimates are
independent-shop national averages and may differ in your area. Some links on this page are affiliate links.