Question about 2004 Suzuki Forenza
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Posted on Jan 02, 2017
before replacing cat converter replace o2 sensors, they go bad and give a false reading that cat efficiency is below threshold ,meaning converter is no good , i would replace o2 sensors and reset engine light and go from there,the o2 s are normaly the problem, unless you hear cat rattling, well good luck,
Posted on Oct 26, 2009
SOURCE: I have an 2004 Suzuki
I am assuming this is a four cylinder engine If so, I would also assume it has a oxygen sensor before the catalytic converter, (upstream) and one behind, (downstream). These sensors send a signal to the engine computer giving an emissions reading level before, and after leaving the catalytic converter. My best guess is the o2 sensors may be functioning normally but, the converter is no longer performing as it should, hence the, (catalyst efficiency below threshold). However, I would not rule out malfunctioning o2 sensors as well.
Posted on Mar 13, 2011
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