Looks like we figured out the transmission issue in the Infiniti

"WesBarton89 - The Way to Santa Fe" (wesbarton89) 05/11/2015 at 16:31 • Filed to: None

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I posted last week that the transmission wouldn’t go out of first gear at times. We looked into it, and the engine gave a P0720, Output Speed Sensor Circuit, or as Nissan/Infiniti call it, the Revolution sensor. So, basically I need a new speed sensor. Speedo reads fine, so it’s a little bewildering, but I did research and discover, that basically, with the issue, the computer doesn’t communicate the proper speed to the transmission, causing the gear to stick, that’s at least how I understood it. So, if I replace that part, it should fix the issue. Luckily, it’s much cheaper than a whole transmission replacement. Hopefully that takes care of it.

dogisbadob > WesBarton89 - The Way to Santa Fe 05/11/2015 at 17:03

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Good luck

pip bip - choose Corrour > dogisbadob 05/12/2015 at 05:03

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fingers crossed.

NoneOfYourBiz > WesBarton89 - The Way to Santa Fe 05/12/2015 at 09:33

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To borrow from the IT industry: “Don’t try to solve a software problem with hardware.” (or vice versa)

Stuff like transmissions have gotten pretty reliable, outliers aside. What’s way more common (especially with Nissan/Infiniti) are sensor glitches.

WesBarton89 - The Way to Santa Fe > NoneOfYourBiz 05/12/2015 at 09:34

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I can believe it. And Nissan/Infiniti makes reliable powertrains, at least their VQ engines are reliable and durable both. 253k miles on the original engine and tranny.

NoneOfYourBiz > WesBarton89 - The Way to Santa Fe 05/12/2015 at 09:49

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The real killer to me though is that if sensors aren’t maintained, they can cause issues that will prematurely wear or outright destroy “hardware.”

I’m thinking specifically of O2, MAF, etc which will over enrich or lean-out the fuel/air mixture, leading to premature cat failure, or even carbonized valves and cylinders.

A really good diagnostic tech is worth his or her weight in gold.

BloodlessWeevil > WesBarton89 - The Way to Santa Fe 05/12/2015 at 13:18

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FYI, the speedometer works because it uses the wheel speed sensors. What you are replacing is the crankshaft speed sensor.

WesBarton89 - The Way to Santa Fe > BloodlessWeevil 05/12/2015 at 13:32

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That makes sense. Never thought of that.