2000 Nissan Maxima SE - DTC P1320 issue

I have a Nissan Maxima with 94K miles on it. About a month ago the service engine light came on. I took it to the local mechanic who
checked the car and suggested I replace the battery. Couple of hours after leaving the garage the light came on again. This time he suggested that I replace all 6-coils for a ridiculous price of 600$. After some research online and sharing experiences with other Nissan Maxima owners, I finally acquiesced and had the coils replaced. One day after leaving the garage, the light came on again.
Now he showed me a copy of the TSB <NTB01-059 - MIL 'ON' WITH DTC P1320 STORED AND/OR SPARK KNOCK (DETONATION) DUE TO IGNITION COIL(S)> and suggested 'Check and replace wiring harness'. Approx damage $1200. There is no way I am gonna shell out that much dough for this car. Any suggestion guys/gals?
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I too got the nondescript 1320 error code on my 2000 GLE (120K miles) and opted to replace all the coils rather than fool around trying to determine which one(s) were acting up - especially when there is such a history of problems associated with the original coils as any search of this newsgroup will reveal.
A number of months prior to getting the code I noticed that my gas mileage seemed to be getting worse and the engine would ping when put under strain such as rapid acceleration or going up a steep hill -- even though I always have used premium gas. These problems seemed to be getting progressively worse over time. About the time the code first appeared the engine would intermittently idle roughly.
I bought the coils over the web for less than $500 and installed them myself in about an hour - a very easy job. Nary a ping have I heard since and my mileage seems to have improved to the tune of > 10%.
If you haven't yet replaced your original spark plugs at 94K miles you might as well do that too when replacing the coils. As for the "Check and replace wiring harness" advise you were given I suggest saving your time and money by focusing on replacing the coil(s), which is the far more likely cause of your problem.
Good Luck,
Feynmanfan
Vijit wrote:

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Thanks for the advise F. I will try to replace the coil # 3 (as the cylinder # 3 was misfiring). I also need to replace my cat conv.
On Dec 28, 5:21 pm, snipped-for-privacy@presar.org wrote:

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> GUEST wrote: > I have a Nissan Maxima with 94K miles on it. About a month ago the > service engine light came on. I took it to the local mechanic who > checked the car and suggested I replace the battery. Couple of hours > after leaving the garage the light came on again. This time he > suggested that I replace all 6-coils for a ridiculous price of 600$. > After some research online and sharing experiences with other Nissan > Maxima owners, I finally acquiesced and had the coils replaced. One day > after leaving the garage, the light came on again. > > Now he showed me a copy of the TSB <NTB01-059 - MIL 'ON' WITH DTC > P1320 STORED AND/OR SPARK KNOCK (DETONATION) DUE TO IGNITION COIL(S)> > and suggested 'Check and replace wiring harness'. Approx damage $1200. > There is no way I am gonna shell out that much dough for this car. Any > suggestion guys/gals?
Vijit are you from Albany?
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