Golf IV / Jetta IV :: Chokes The Power Past 3500 RPMs And Continue Running Rough


Mar 29, 2016

I own a 2001 Jetta GLX 12v VR6, lately the car has not been running well. It chokes the power past 3500 rpm's and will continue running poorly and sound sort of like a Subaru boxer engine. Sometimes it corrects itself and runs okay but goes back and forth.

I ran the codes on VAG COM:

6 faults found:
17551 - Load calculation cross check
P1143 - 35 - 10 upper limit exceeded - intermittent
16712 - Knock Sensor 1 (g61)
P0328 - 35 - 10 Signal too high - intermittent

[Code] .....

I ran VAG COM a couple of days before these codes came up and I had a different code dealing with air/fuel mixture, something about fuel running to rich. I'm stumped.

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I am leaning towards maybe an electrical issue? Bad ground, alternator output or something. Any tips on places of ground, connectors etc to clean and check? Also one or two guys keep mentioning coolant temp sensor and crank position sensor...but wouldn't those toss a code too?

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