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View Full Version : Quick 2.8L O2 Sensor Help...



witwer4444
11-15-2009, 06:33 PM
Hey guys

I have had a CEL on for about a month now and I finally want to get it fixed. I took it to Autozone and scanned it with the OBDII and then scanned it last week with a buddies VAG COM. Im pretty confident its caused by a faulty O2 Sensor but I dont know which one.

Here are the codes:

OBDII - P0173 (Fuel Trim Malfunction Bank 2)

VAG - 16543 (O2 Sensor Circ.,Bank2-Sensor2 High Voltage)

VAG - 17585 (O2 Correction Behind Catalyst,B1 Limit Attained)


Let me know if you guys have had these codes and/or which O2 sensor I will need to replace.

TIA

mholme
11-15-2009, 06:38 PM
Both of those codes are downstream, secondary sensors. Bank 1 is passenger, bank 2 is driver.

witwer4444
11-15-2009, 06:48 PM
So all I will need is the Drivers Side sensor after the CC? And only 1?

http://www.autozone.com/autozone/catalog/parts/partsProduct.jsp?displayName=Oxygen+Sensor&itemId=117-0&navValue=16100117&parentId=61-0&productId=312980&fromString=&itemIdentifier=312980_43598_1784_14573&filterByKeyWord=&categoryNValue=&isSearchByPartNumber=&categoryDisplayName=Exhaust&store=2127&skuDescription=Bosch/OxygenSensor&fromWhere=&searchText=&_requestid=847210

Hows that look?

And is it a good idea to replace them as they fail or all of them at once?

mholme
11-15-2009, 06:55 PM
You should shop those prices around. You've also got a B1 code, which is passenger side. Still a downstream sensor, but if they do turn out to be bad, you're lookin at a pair. Did you clear the codes?

witwer4444
11-15-2009, 07:36 PM
ya i have like 3 times. Hmmm so I take it Bosch makes a good product. Do you know anywhere that has them cheaper?

witwer4444
11-15-2009, 07:46 PM
http://secure-online-checkout.com/cart/cart_PBJ_2.asp?PBJ=090209_212556_0008234269_AUD_X&year=2001&make=AU&model=A4-Q-004

How do those look. Those are really good prices, and are BOSCH OEM Rear left and Right sensors. So those codes are thrown by both sides correct?

mholme
11-15-2009, 07:58 PM
The last time I priced them, they were in the 125 range, so those prices don't seem bad. Some places offer non plug and play Bosch sensors that need to be spliced in. A lot cheaper but also a lot riskier if you don't know what you're doing.

witwer4444
11-15-2009, 08:00 PM
http://www.mjmautohaus.com/catalog/shopping_cart.php?info=Bosch_078906265F_Oxygen_Sen sor_Rear_Left_OEM

Thats even better. I got my timing belt from MJM and I have to say they do have the best prices! 2 OEM O2 sensors for under $200 w/ free shipping!!! :)

somebody5788
11-15-2009, 08:00 PM
I've done the splice in before. if the wires all match up it takes about 5 min to do the wiring and saves a shit ton of time if like on the car I was doing the sensors plugged in behind the engine (I think ours are by the ECU but in front of the 2nd firewall) but I guess not everyone can do the splice. It may require a torch to get the sensors out if they are seized good enough.

witwer4444
11-15-2009, 08:24 PM
Nic-

Chances are I'll be doing this with you - of course if you want to that is

Haha and for $200 I'd rather just get the plug and play ones and it will make it easier for us. You have the tool to pull them out right? And I bet they will be in there pretty tight, I doubt theyve ever been changed

somebody5788
11-16-2009, 06:29 AM
Nic-

Chances are I'll be doing this with you - of course if you want to that is

Haha and for $200 I'd rather just get the plug and play ones and it will make it easier for us. You have the tool to pull them out right? And I bet they will be in there pretty tight, I doubt theyve ever been changed

Mine were too tight and I gave up.... I didn't want to damage them so I just hung the exhaust when I did my clutch.

IMO the splice in ones are easier. I'd rather splice 4 wires then take an hour to get the wire unhook from all 42 spots.... then again idk how the B5 o2 sensors are routed.

On a side note if both went out that is fishy to me...