Quote:
Originally Posted by Bpzimm
Yeah this helps, thanks. My problem is I DID install the spacers on the upstream 02s at first bc they sent me 4, so maybe that threw everything out of wack?
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YES, NEVER install spacers on the upstream sensors. They are air/fuel ratio sensors controlling how the engine runs and are not related to catalyst efficiency - they are located BEFORE the catalysts in the factory header. Any fault codes return with spacers only on the downstream? You might need to stack 2 or 3 on each side.