My uncle has a '96 Subaru that failed. I told him to get a new O2 sensor and maybe change the egr valve. I heard someone here say they dumped something in the tank to pass.

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'85 300SD (formerly california emissions)
'08 Chevy Tahoe
'93 Ducati 900 SS
'79 Kawasaki KZ 650
'86 Kawasaki KX 250
'88 Kawasaki KDX200
'71 Hodaka Ace 100
'72 Triumph T100R