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Speedometer and mileage

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nydesi786

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Discussion starter · #1 ·
Hello All,

I am new to this forum and recent owner of Treg 05 v8. I bought the car at a decent price due to speedo and odo not working and also fuel gauge jumping around . I have love for the car but wondering if anyone else experience similar issues and had success in fixing this.

The cruise control is also not working. I have checked all the fuses on both sides all seems to be good.

Checked the cam shaft sensor and that seems to be good, but was not able to locate the speed sensor.
Anyone knows where that is located and how I can fix.

ran a scan getting codes : P0501 - Implausible Signal & P0322 - Engine Speed Sensor (G28) No Signal

Thank you in advance !
 
#3 ·
Where in the world are you?

One key concern on your early V8 is knowing with 1,000% certainty that the timing belt, tensioners, water pump and thermostat are less than 80,000 miles/5 years old.

The timing belts do break and the engine is toast.
 
Discussion starter · #5 ·
I am in New York. Timing belt was replaced around 120K in 2013 - mileage stopped last year when i bought it around 146K - currently it should be around 160K.

Didn't know that can cause for the speedometer not working?

Thank you in advance
 
#8 ·
nydesi786 said:
I am in New York. Timing belt was replaced around 120K in 2013 - mileage stopped last year when i bought it around 146K - currently it should be around 160K.

Didn't know that can cause for the speedometer not working?
Click to expand...
LOL!

No, the belt is not related to your speedo failing. It was a heads up on maintenance that's often missed on the older V8s.

Notwithstanding that the car''s service history says you need to do the belt, etc, this year at 5 years old.
 
#9 ·
I wouldn't sweat the timing belt issue. I had mine replaced at 127000 miles and the mechanic said there was no ware on any of the parts.
He thought it may have gone an other hundred thousand with no problem.
You went 120000 on the first may not be a problem for a lot longer.
 
Discussion starter · #10 ·
Thank you for all the replies I really appreciate it. Yes definitely want to keep those repairs in mind as when doing the timing or any of those other parts I would most likely get all the parts done.

I don't want to try to get another speedo and go through other troubles unless I am sure that it is the speedo that needs repair and not just the VSS.

Any idea where that would be located on a V8 model ?

Once again thanks for all the replies.
 
#11 ·
Mgtouareg said:
I wouldn't sweat the timing belt issue. I had mine replaced at 127000 miles and the mechanic said there was no ware on any of the parts.
He thought it may have gone an other hundred thousand with no problem.
You went 120000 on the first may not be a problem for a lot longer.
Click to expand...
That is very irresponsible advice.

You may have got away with it.

Others haven't and when the belt goes the engine is toast.
 
#13 ·
Imagine the transmission was removed from the vehicle and you are looking forward from the rear of the engine. From the center of the crank move to 9 o'clock on the block. The crank position sensor is at that position on the outside of the block. Its secured with a multi head bolt so you can use either a 10mm socket or a 5mm to remove it.
Regular thread and be sure to not pinch to o-ring when installing the new one or you'll have a leak.
 
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#15 ·
Sorry, my bad. At the start of the post and the fault codes listed were for an engine speed sensor.
Vehicle speed sensor is located in the tranny. It is a hall effect sensor that I am pretty sure is replaceable by itself, but I think you have to remove the valve body to get at it.
You really need to use VCDS to monitor the correct measuring block for the sensor output. From memory. Block 002 in transmission will give you the Input & output shaft speed and sensor output voltages.
Output shaft speed is the VSS you speak of. Start there to diagnose.
 
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Discussion starter · #16 ·
Thank you for the information this really helps. I will need to set apart some time to start this project .
Will keep you updated. I kind of had heard that it was in the tranny, but was hoping to see if it was located else where. :)

Again Thank you !!
 
#17 ·
nydesi786 said:
Anyone out there able to assist with location of speed sensor in the V8 model ?
Click to expand...
If you are looking for the sensor for vehicle speed it is taken from the ABS sensors in the wheel hubs.
 
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#18 ·
Mgtouareg said:
I wouldn't sweat the timing belt issue. I had mine replaced at 127000 miles and the mechanic said there was no ware on any of the parts.
He thought it may have gone an other hundred thousand with no problem.
You went 120000 on the first may not be a problem for a lot longer.
Click to expand...
I respectfully disagree.
Especially on the running it for another 100,000 miles.

These are interference engines if we are talking about the 4.2 V8.
Interference meaning that if the belt breaks the valves hit the pistons and that's all she wrote.

Not to mention another two of the reasons for doing the timing belt are:
Replacing the water pump with a new one as these tend to wear the bearing out of the pump.
And replacing the anti-freeze which tends to start turning acidic after 5+ years. That's why people tend to start having radiator and heater core leaks. The now acidic coolant starts to eat away at the metal.
 
#19 ·
I keep seeing this conflict where some people say the vehicle speed comes from the wheel speed sensors and others say it come from a sensor inside the transmission. Which is it? Im trying to diagnose a non working speedo / non shifting trans / no vss reading on my live data code scanner and ecm has logged a p0501 code for vss performance. Also a 2004 v8 touareg
 
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