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2001 Forester -S
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7 Posts
Discussion Starter #1
I have Forester 2001 S, 135K miles Can’t get rid of Check Engine Sign.

Replaced Knock sensor in 2002

Replaced Oxygen sensors in 2004

Replaced Cat. Converter in 2009 and Sign came back , again Cat. Converter

Need advice.
 

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Registered
2002
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99 Posts
Mine is that code, but i have a code reader and i delete it and it will be gone for months at a time.

p0420-catalytic-converter-efficiency-below-threshold
 
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