Rpm fluctuates

Asked by Carlos Jul 10, 2018 at 11:18 AM about the 2008 Nissan Sentra Base

Question type: Maintenance & Repair

I took the car to auto zone and it coded p 1421, is
this the oxygen sensor  , because my rpm
fluctuates and shakes ?
Can someone please give me some advice on how
to handle this situation .

4 Answers
40,075

beatupchevy answered 6 years ago

It could very well be the sensor , you may have more than one , the code tells you where the trouble is not what to replace , you may not be able to get the old one out because exhaust threads tend to rust and seize , take it to a shop is my advice

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130

NissanB2013 answered 5 years ago

I own a 2013 Nissan Sentra sedan & my rpms are fluctuating anywhere from 1-4 rpms and it sometimes has a hard time taking off and when I'm driving the rpms are never steady and now it's been a week and it's starting to kick back and fourth when I drive. I took it to two body shops and one was the Nissan shop. I have zero lights on and they didn't find any codes pop up either scan test and it's getting worse. How do I know if it's my transmission or something else if I can't find a code pop up through body shops or if it's not triggering one on its own while driving!!! HELP

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