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16/11/2021 11:27 pm
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- I've have a 2002 Nissan Maxima with 195k miles on it. For the last year or two I've had an intermittent check engine light staying on with a P0420 code. For the last 3 months it has stayed on continuously. I tried a tank with techron fuel system cleaner with no change. Today tried filling up with Shell premium V power Nitro plus. Within a few minutes the check engine light went off and so far has stayed off for about 30 miles which it hasn't done for months. Not sure if it's the premium gas or the better additives( I had been running regular in it prior to that.) Any thoughts on this? I did see a comment online of someone having a similar experience. I've never been a big Shell fan in the past. I've either run discount gas or Chevron. The Chevron eliminated a knock issue I had a few years ago but it hasn't seemed to help this so I thought I'd try the Shell premium.
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