fyreous

Hey everyone,

I've got a 2002 A4 1.8T Quattro (5spd) - the check engine light and EPC light came on yesterday as the car engine literally just shut off while I was pulling out of a parking lot.

It started fine again the next day, but the engine light is still on, and I'm a bit uneasy.

I got it scanned ad came up with codes PO321 and PO322. The tech told me that it was my CKP (Crankshaft) position sensor, but to check the connection first and make sure it's hooked up securely before I buy a new one.

My Questions:
1) Where is this located on my car?

2) Anything else I should consider checking besides this sensor?

3) What's the difference between the "Crankshaft Position Sensor," "Camshaft Position Sensor," and "Engine Speed Sensor"? (if any at all)

Thanks very much for any help!

fyreous

Okay, so after a few days of searching around online, I found what I was looking for. I figured I'd post the answers for the benefit of anyone else who has the same problems:

1) Here is a link with pictures and instructions on locating, removing, and re-installing the "Crankshaft Position Sensor" (also called the "Engine Speed Sensor" and "CKP Sensor") - http://www.a4mods.com/index.php?page...tml&category=5

2) Nothing else really needs to be checked unless more codes come back after replacement.

3) The "Camshaft Position Sensor" is indeed a different part. It is located on the front of the engine block, right behind the timing belt cover, and looks VERY easy to replace, should that ever be required.


Hope this helps others who are in the same boat as me...

gustavoalba

Hello I'm having a similar problem, but my EPC signal goes on and off for periods of time, wile it's on the car has a lot less power, after a while i turn off the car and back on and it will shut off the signal.

Any recomendations for this.

My local audi service, incredibly hasn't found a solution nor a diagnostic for my problem, so i hope some of you could help me out.

SkeetVW

So oddly enough I just dealt with this issue. We have a 04 Jetta 1.8t wolfs-burg edition.


Over the last 2 years:
The car was kind of sputtering on acceleration. I didn't think much of it really. Maybe some dirty plugs, filters, or something like that. I went and changed or cleaned all that out. New plugs, seafoam cleaner, and it really didn't seem to make a difference. I just chalked it up to the age of the car so we got a new Wrangler. Gradually the car got worse. It started to choke while cursing on the interstate but come back right away. No check engine lights or warnings.

Yesterday: (July 25 2012)

Wife was headed home and it finally died on her on the express way. She said she couldn't start it and had the check engine light and EPC light on. I went out to help her (2 miles from home)and was able to start the car. Drive it to AutoZone to check the code and got P0321 read:

Word for word, letter for letter from the receipt AZ printed out.


Troubleshooting P0321 0.00
OEM Brand: Volkswagen

Definition
Ignition engine speed input circuit
range/performance
Explanation
Open or short circuit condition
Probable cause
1.- Poor electrical connection
2.-faulty CKP sensor


Anyway picked up the part at AZ and it cost almost $100. You can get it a lot cheaper if you are patient enough. I couldn't wait, it had to be replaced the next day.

Anyway. A few tips. The sensor itself and is adjacent to the oil filter. Really hard to get to.

1. Put the car up on ramps and take out the filter. It makes getting to the sensor a lot easier. Some oil will come out but not enough to worry about. I's say there was about 6 oz of oil that came out. Bolt is a 10mm bolt. You will have to wiggle out the sensor. It will take a little time but it will come out.

2. DO NOT yank on the clip, you will break the wired. (remove plastic covers on the engine) Get to it from under the hood and not below the car. Remember where the wiring goes, behind a large hose. You will have to un-clip the grey plug from the body of the engine and feed it through to where you can get to it from the upper engine compartment. A flat head screw driver will work to release clip lock.

3. Make sure when you have plugged in the new part, that you re-feed the wire behind the hose that it came out from behind. otherwise it will not reach. Clean the surface area and area around where the sensor is going to be. Mine was covered in crud. The Bolt has a pointed tip so it makes it easier to insert the the bolt. I started it with just my fingers and then went to the ratchet.

4. Clean off area around the oil filter and engine and put the filter back on. After that replace all the plastic parts you took off of the underside and engine and you are done.

Final thoughts
All total this took me a few hours because the part had to be driven in from another location and I needed the engine to cool down before I could work on it. I even had my 11 year old niece working with me on this so it was not to difficult. I'm by no means a mechanic but I am not afraid to work on cars. If you can change your oil, you can change this part. I hope this helps everyone. I've since reset the check engine light with my iPhone and its been running a lot better then I expected. There is no more sputtering on acceleration and on the highway the car runs beautifully. I hope this helps other out there. All total I spent about 250, 100 for the part and 150 for a decent tool kit since I broke my last ratchet set. I am told that this can run you about $600-$1,200 at the dealership. Work time took a total of 4 hours as it was about 102 outside and 90% humidity. I had fun and was a great bonding experience with my niece.


Take off plastic guards


Location of the sensor



ALWAYS WEAR SAFETY GLASSES

ALLDATAdiy INFO

Alldatadiy.com has DTC codes and repair procedures. Good Luck with your issue!!

Shawn Johnston

Hey everyone,
Ihad all these
I've got a 2002 A4 1.8T Quattro (5spd) - the check engine light and EPC light came on yesterday as the car engine literally just shut off while I was pulling out of a parking lot.

It started fine again the next day, but the engine light is still on, and I'm a bit uneasy.

I got it scanned ad came up with codes PO321 and PO322. The tech told me that it was my CKP (Crankshaft) position sensor, but to check the connection first and make sure it's hooked up securely before I buy a new one.

My Questions:
1) Where is this located on my car?

2) Anything else I should consider checking besides this sensor?

3) What's the difference between the "Crankshaft Position Sensor," "Camshaft Position Sensor," and "Engine Speed Sensor"? (if any at all)

Thanks very much for any help![/QUOTE]
What I done was reset all the codes and turned my s tereo off and left it off because I was reading people having problems when they change out factory radio.evidently all wires run together in there somehow and knock on wood no engine lights or esc lights.done drove over 300 miles and code free.don't ask me why but its driving like a dream.

lyleswk

Called an Engine Speed Sensor (g28) on the A4. See below.

http://wiki.ross-tech.com/wiki/index...5/P0321/000801

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