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Discussion Starter #1
Hi,

I've had an intermittent P0420 for some time, and have changed both O2 sensors with OEM. Light continues.

Just changed the spark plugs, and they are a bit oily. I'll attach a photo here.

Googling around makes me think that the cat is responding to oil getting into the system. Which would likely be rings or valves... not good! Will be very grateful for any suggestions.

Thanks!

2009 SX4, 94k miles
 

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Discussion Starter #3
Are they the original plugs or the replacements? My 1st impression was the gaps look wide.
Thanks, PaulD. Not sure, bought the car second-hand four months ago...

Just checked the gaps, and they are all in-spec: between .040 and .044", 1.0 and 1.1 mm.
 
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