B1709 Subaru Auto Trouble Code

Parts or components should not be replaced with reference to only a B1709 Subaru DTC. The vehicle service manual should be consulted for more information on possible causes of the fault, along with required testing.

Evaporative emissions systems test for a leak in the fuel tank and associated hoses. To perform the test, the computer pulls a vacuum and checks to see if the vacuum holds. Each car maker uses a different techniques to check, but most often it's some type of fuel tank pressure sensor.

B1709 Subaru Possible Solution:

Gasoline engines use spark plugs to cause an explosion of fuel within the cylinder. In a properly timed engine, this explosion occurs at the proper moment to send the piston to the bottom of the cylinder and provide power to the drive shaft. If the plug wires are out of sequence, the explosion occurs at the wrong time. The improper timing of the explosion sometimes pushes the cylinder the wrong direction or interferes with the turning of the crank. As a result, the engine stutters or backfires, if it runs at all.

B1709 Subaru Description For All Models :

Subaru 1.8
Subaru 1400
Subaru 1600
Subaru 360
Subaru Alfa
Subaru B11
Subaru B9
Subaru Baja
Subaru Coupe
Subaru Dl
Subaru Ff-1
Subaru Forester
Subaru Forester 1
Subaru Forester 2
Subaru Forester 3
Subaru G3x
Subaru G3x Justy
Subaru H6
Subaru Hm
Subaru Impreza
Subaru Impreza 2
Subaru Impreza 3
Subaru Justy
Subaru K111
Subaru Legacy
Subaru Legacy 3
Subaru Legacy 4
Subaru Leone
Subaru Liberty
Subaru M80
Subaru Mini Jumbo
Subaru Outback
Subaru Outback 2
Subaru Outback 3
Subaru Pleo
Subaru R1
Subaru R2
Subaru Rex
Subaru Sagres
Subaru Stella
Subaru Stx
Subaru Svx
Subaru Traviq
Subaru Tribeca
Subaru Vivio
Subaru Wx
Subaru Xt
Subaru Xv

B1709 Subaru Trouble Repair :

If your vehicle failed a B1709 Subaru test and the B1709 Subaru Check Engine Light is NOT on, chances are you have a problem with the OBDII system, a burned out MIL lamp, or a faulty catalytic converter. The converter is essentially an afterburner that cleans up the exhaust after it exits the engine. The OBDII system uses a ownstream oxygen sensor to monitor the efficiency of the converter, and it should detect a drop in converter efficiency if the converter has been contaminated or is failing (ignition misfiring, leaky exhaust valves, and oil burning can all damage the converter). What you want to look any conditions that might cause ignition misfire, an overly rich or lean fuel condition, or loss of compression. Use your OBD Express DIY to look at the oxygen sensor outputs, coolant temperature, airflow, calculated engine load, and inlet air temperature.

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