Join Date: May 2016
Location: Charlotte, NC
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I'm getting a P0421 error code and the CEL comes on and off intermittently on my Versa. The shop that regularly cares for Baby says that they're not exactly sure what that could be - the rear O2 sensor may be bad or I may need a new catalytic converter. I've been in a "watch and see" mode for a few months now.
Yesterday, after doing the "Nissan Pedal Dance" to read the OBDII codes, the SES light is now on. I looked at some prices for an O2 sensor and catalytic converter parts. Huh? Wait. The cost to do the work and parts from the shop were quoted at a rate of nearly $800-1200. I can do this myself for about $300.
I grew up in the automotive industry, was a District Sales Manager and District Service and Parts Manager for three of the Japanese auto manufacturers years ago, so I'm not shy when it comes to working on cars. However, I do not consider myself a true hobbyist or shadetree mechanic. That being said, I am giving serious consideration to changing out the cat and O2 sensor myself, given the cost.
For those of you who have done so, what kind of issues did you run into unexpectedly? Would you recommend others do the work themselves? Mine is an 09 HB SL 1.8L. Thanks for your input in advance!