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TDI (Diesel) Emissions This is a discussion about emissions from TDI's. Pro's cons of Diesels (including biodiesel) effects on the environment and how they compare to Gasoline and other fuel sources for Internal combustion engines.

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Old April 16th, 2014, 13:05   #1
regidog
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Default Exhaust Pressure Sensors (P047C)

Got a check engine light on my 2009 Jetta TDI last night. Brought it to the dealer and they pulled code P047C and recommended replacing the two exhaust pressure sensors. Parts and install was to be $650. I looked up these parts and installation. It seems pretty straight forward but do I need VAG Com to reset the system. Can anyone advise on the install and best place to get parts? thanks
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Old April 16th, 2014, 13:18   #2
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Originally Posted by regidog View Post
Got a check engine light on my 2009 Jetta TDI last night. Brought it to the dealer and they pulled code P047C and recommended replacing the two exhaust pressure sensors. Parts and install was to be $650. I looked up these parts and installation. It seems pretty straight forward but do I need VAG Com to reset the system. Can anyone advise on the install and best place to get parts? thanks

The best place is probably a VW dealer. Both sensors are the same part number, but make sure you have your VIN number with you when you go to the dealer. Sometime in mid 2009 they changed the part number of these sensors. The last letter changed from an "A" to a "B". You must make sure that you get the correct one. A VW dealer can tell by your VIN, or you can look at the one that is easier to see (the one above the AUX fuel pump) and read the part number on it. You should be able to get the sensors for around $100 each (on-line price). You probably only need one of them, but figuring out which one can be problematic. It appears that the names of these 2 sensors got reversed between the CBEA (2009) and the CJAA (2010+) engines.

and Yes, you will need VCDS to reset these sensors so that the ECU adapts to the new sensors. Open the engine controller and choose "Advanced Coding". A pop-up will tell you what numbers to enter to adapt the new sensors. These sensors are on top and are pretty easy to replace. Just remember that the one above the DPF can get quite hot. Don't burn yourself.

Have Fun!

Don
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Old April 16th, 2014, 14:35   #3
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Thanks that was a big help. I will report in when fixed.
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Old April 16th, 2014, 19:01   #4
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Picked up the car from the dealer and the diagnostic sheet lists two part numbers for the sensors (G450 and G451). Are these sensors identical other than part number or are there 2 separate sensors?

I looked at the sensor directly behind the canister in my car and it is part number 076 906 051A.

thanks for the help
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Old April 16th, 2014, 21:57   #5
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Originally Posted by regidog View Post
Picked up the car from the dealer and the diagnostic sheet lists two part numbers for the sensors (G450 and G451). Are these sensors identical other than part number or are there 2 separate sensors?

I looked at the sensor directly behind the canister in my car and it is part number 076 906 051A.

thanks for the help
That 076 906 051 A is the sensor you want. There are 2 separate sensors but they are the exact same part. G450 and G451 are the 2 pressure sensors and they are both the same part number. One of them is mounted on top of the bracket that holds the AUX fuel pump and the other is snapped into a little insulation "blanket" above the DPF. If your dealer looks up the part numbers, they will find two different part numbers. One is the sensor above the DPF and the other is the exact same sensor - but it comes with a whole new mounting bracket (which about doubles the price). You do not need the whole new mounting bracket. Just order 2 of those 076-906-051A sensors - they will work in both places. The hardest part of replacing these sensors is getting to the hose clamps to take the hoses off of each sensor.

As I said above, there is a good chance that only one of these sensors is actually bad. You might be able to get away with buying only one sensor, replace one of these sensors, use VCDS to adapt the sensors, clear the fault code and go for a drive. If the fault does not come back, you are good. If the fault does come back replace the other sensor with the one you removed before, adapt, clear faults, and drive again to see what happens. You have about a 50/50 chance of picking the right sensor the first time. If you want to get it fixed as quickly as possible, buy both sensors and shotgun it all at once.

Have Fun!

Don
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Old April 17th, 2014, 04:19   #6
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thanks Don.
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Old April 17th, 2014, 04:49   #7
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From my experience, you're better off to replace BOTH sensors on the 2009s with the newer P/N sensors, and reset the DPF pressure parameters.

It's kinda funny and sad at the same time, since these stupid sensors are what Ford used for so long to monitor EGR flow. And they failed, over and over again. Nice to see the Germans using defunct American tech and not really making it much better. *sigh*
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Old April 17th, 2014, 08:54   #8
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From my experience, you're better off to replace BOTH sensors on the 2009s with the newer P/N sensors, and reset the DPF pressure parameters.
That works? I helped a guy with a 2009 (not mine) and he bought the wrong sensor (a "B" version) and it did not work. The VW dealer told him that he needed the "A" version, so he bought another one and it worked. He only replaced one of them. Is the problem that both sensors must be the same type? Are the newer ones (the Bs) actually more reliable?

Since I have already helped 2 people replace these sensors (with VCDS), I was actually considering buying a spare sensor for my car (a version A). If the B version is actually better and it will work OK, I will wait for the failure (if it occurs) and just buy 2 of the B version of the sensors.

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Old April 19th, 2014, 07:02   #9
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Sensors are in and the check engine light is off. Took about an hour to install both. Thanks for the help
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Old April 19th, 2014, 09:35   #10
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I've had to replace the same sensor in my car...two years ago (@ 54,730 miles).
Check Engine Code was P0470 (Differential Pressure Sensor Abnormal).
VAGCOM code: G450 Exhaust Pressure Sensor 1 Error.
So I replaced sensor 1 with 076-906-051B. BUT the check engine light came back on that same day.

So thinking that pressure sensor 2 was probably the actual issue....I replaced pressure sensor 2 with the original pressure sensor 1. This fixed my issue.

The exhaust pressure sensor 2 has P/N 03G 906 051G written on it. I'm sure that part number is superseded by 076-906-051B.

PS: These sensors (VW OEM 076-906-051B) can be purchased online for $72.00
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Old April 19th, 2014, 12:21   #11
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So I replaced sensor 1 with 076-906-051B. BUT the check engine light came back on that same day.

So thinking that pressure sensor 2 was probably the actual issue....I replaced pressure sensor 2 with the original pressure sensor 1. This fixed my issue.
There seems to be some debate and possibly even some differences between model years about which sensor is G450 and which one is G451. This is probably why many people just shotgun it and replace both at the same time. They are both on top of the engine and relatively easy to get at.

The service and repair manuals might be wrong in some details. I have read where people have said that they are not only different part numbers (A or B) between 2009 and 2010 cars (CBEA & CJAA engines), but that the locations of G451 and 450 are reversed too. I do not know if this is true or not. However, you are not the first person I know who did exactly what you did (replace one, fault returns, replace the other one with the one removed in step 1, and it works). We seem to be unclear about which one is G450 and which one is G451. VW's own documentation could easily be wrong or it is also possible that VCDS has the 450 and 451 numbers backwards.

Here is what I know for sure (from experience):
1)-Both differential pressure sensors are the same. Don't let the parts guy sell you the whole new bracket for the one above the AUX pump at double the price of the sensor alone.
2)-most 2009s use the 076 906 051 A sensors.
3)-All 2010+ use the 076 906 051 B sensors
4)-The transition between the A and B models occurred near the end or the 2009 production run. IOW: some late 2009 models use the -B version of the sensor. I do not know the VIN or build date cut-in of the new version.
5)-You cannot intermix the A and B part numbers in the same car at the same time. You need to buy the correct one or perhaps replace both.
6)-Contrary to what has been posted in some procedures, you do not need to reset/adapt the new sensors before you start the engine. I know a guy who replaced his sensor and then drove to my house with the CEL on (for VCDS). I adapted the sensors, cleared the fault codes and everything works.

Note: The "perhaps" in #5 above is because I am still awaiting confirmation from oilhammer (or someone else) to my question in Post #8 in this thread. Will it work in a 2009 if both sensors are replaced with the B version (I suspect so, due to point #4 above) and is there any advantage in doing so? Are the B versions actually any better - do they fail less often, or are they just cheaper (for VW not for us).

Have Fun!

Don
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Old April 21st, 2014, 06:17   #12
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The VIN split for 2009 (CBEA) was for two sensors that BOTH have an A suffix:

03G-906-051-A

076-906-051-A

The '03G' prefix part was superceeded to the '076' prefix part.

Then, the 2010 (CJAA) was the 076-906-051-B. Unless of course, it is the Audi A3, which still uses the CBEA engine 2010+, which also uses the 076-906-051-B.

The last time I tried to order the 03L-906-051-A it got backordered. I waited for nearly a month, and finally they sent a 076-906-051-B. ETKA still shows no supercession, but I think that BOTH of the 'A' suffix parts have been replaced.
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Old April 21st, 2014, 10:59   #13
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After I installed the sensors the CEL immediately went off. I did not "adapt" the sensors but have not driven the car much either so maybe the light will come back on. I have VCDS but am new to it. How do I adapt the sensors? Thanks
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Old April 21st, 2014, 11:13   #14
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After I installed the sensors the CEL immediately went off. I did not "adapt" the sensors but have not driven the car much either so maybe the light will come back on. I have VCDS but am new to it. How do I adapt the sensors? Thanks
The basic instructions are in post #2 above:
Open the engine controller and choose "Advanced Coding". A pop-up will tell you what numbers to enter to adapt the new sensors. These sensors are on top and are pretty easy to replace. Just remember that the one above the DPF can get quite hot. Don't burn yourself.

It is really very simple:
Start VCDS
open controller #1 (engine)
click on the button marked "Advanced Coding"
There will be a window near the bottom of the screen where you can enter a number.
A pop-up window will appear with 3 or 4 choices, one of them will say something about "reset DPF pressure sensors" or something close to that. It tells you to enter a 5 digit code.
Enter that code in the window and press the button that says "do it".
You will see a message that says "coding accepted"
Clear fault codes (if any)
That's all folks!

Have Fun!

Don
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Old April 22nd, 2014, 06:20   #15
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Adapted the sensors last night. Took 2 minutes. Thanks again for the help.

Now to fix the aux jack on the radio.
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