Question about 2001 Jaguar S-Type

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P0420 Error code, I had the sparks plugs replaced in dec...now one is misfiring again.

Hi, I have a 2001 Jaguar S-Type 4.0. My car failed emmissions because of three error codes. P0420, a misfire (don't have that code), and an error about the O2 sensor in bank 1. I had a tune up in December 2008. The error codes disappear. My car now intermittently stutters when I accelerate. The last time that happened the spark plug needed to be replaced. Does this happen often? I took my car to National Tire and Battery. Since its under warranty, should I just get the spark plugs replaced again. Is there a way to tell if there is a shortage or something? The reason I ask...I notice that the car really stutters when it rains..but does it less when its dry. Sometimes, when starting my car, its takes a few cranks to start up. What may be causing this? I also hear a ticking noise, but the ticking isn't as loud AFTER getting an oil change. I have my oil changed at NTB as well. Should I be adding some kind of hi mileage oil to my engine? Please advise. Thanks in advance.

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I dont know if this 402 code is a miss code on a jag but usually miss codes are p0300 codes. if you are hearing a ticking and you own a spray bottle, an old mechanics trick is to mist water on the plug wires while the engine is running preferrably in the dark.

Posted on May 20, 2009

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