Recently bought 2001 A4 question on fuel economy
03-22-2010, 09:19 AM
#11
AudiWorld Super User
Alpha-bid.com has a cable for $18.33, if you have prefer to use a computer. There is also a hand-held scanner "U280" for less than $30, if it works like they say, that's a deal.
You can test the sensor with a DVM, but you might as well get the scan tool and do it that way, because then you can see what the enging control unit is actually reading at start-up, and later when warmed-up. Regarding warming-up, your engine will reach proper temperature faster, and have less chance to sludge the oil, if you drive it as soon as it's running.
You can test the sensor with a DVM, but you might as well get the scan tool and do it that way, because then you can see what the enging control unit is actually reading at start-up, and later when warmed-up. Regarding warming-up, your engine will reach proper temperature faster, and have less chance to sludge the oil, if you drive it as soon as it's running.
03-23-2010, 03:56 AM
#13
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I do let it run a bit before I drive off. if i let it run for about five minutes, and then start driving. its not at prime operating temperature but it certainly isn't cold. is there a way to test the coolant temp sensor with a multi meter?
I think I'll order a code reader. anything in particular I should look for in a code reader?
I think I'll order a code reader. anything in particular I should look for in a code reader?
03-26-2010, 09:03 PM
#17
AudiWorld Super User
You will need a 22mm crow's foot wrench to loosen/tighten that O2 sensor because of space limitations. A good quality one could be over $25, however I bought an assortment of 10 cheapos for $20 and the 22mm worked fine, after I filed it to fit. Pre-cat sensor B2 on the passenger side is comparatively easy to get at. With the right tools this is a 5-minute job.
03-26-2010, 10:00 PM
#18
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You will need a 22mm crow's foot wrench to loosen/tighten that O2 sensor because of space limitations. A good quality one could be over $25, however I bought an assortment of 10 cheapos for $20 and the 22mm worked fine, after I filed it to fit. Pre-cat sensor B2 on the passenger side is comparatively easy to get at. With the right tools this is a 5-minute job.
Are the OEM sensors really worth the extra $?? at less than half the price the Bosch universal sensor looks pretty nice.
03-27-2010, 01:30 PM
#19
AudiWorld Super User
Using the Bosch universal type is your call. The OEM is sure easier, just plug it in, but I figured that 15 minutes or so of joining wires using their splicing setup was worth the savings. Don't solder the wires, because this could change the voltage characteristics. I did mine about 3 weeks ago and good so far. If I lived in a really wet environment, I might be more likely to go with the OEM part.
