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Mazda3 Check Engine Light

Posted: Mon Mar 15, 2021 5:52 pm
by bill25
So... Check engine light came on a couple weeks ago. Codes were not super helpful - P0455 - evap leak, and P0171 - System too lean.

I reset, and they came back fairly soon after.

I did some digging and managed to find P0661 - Intake Manifold Tuning Valve Control Circuit low. This was obviously the most specific. I think this came up when I did a check with the scanner.

I ended up checking the Intake Manifold Control Valve, sure enough, it was testing infinite resistance meaning open circuit. From what I read, that means failed.

I used this to locate it and understand what needed to be done to change it:
https://www.youtube.com/watch?v=Vu6njFBISro

It is the orange/brown one.

The replacement used the same nut from the factory... It didn't fit great. Took a little to get it on but after that, it seems fine. Hopefully this is fixed.