What is the difference between these two Crankshaft position sensors?

http://www.autopartswarehouse.com/de...QAC213151.html

http://www.autopartswarehouse.com/de...3-1682756.html

The second one is a crank sensor, the first one looks more like a cam sensor, can't say I've seen a crank sensor that looks like that.

Thats what I thought, I was looking at the CKP that was taken out and it looks like the second. I am watching prices in case I'll have to buy one. Any suggestions which brand of downstream O2 sensor I should get, since I'm getting codes for it (0036 and 0141)

Theres a wide variety on Rockautoparts, ACdelco is looking pretty expensive, can I get something else? I'm looking into it because I'm getting terrible fuel economy (ie 51 miles to a quarter tank)

Remind me what year car this is again? having that info in your sig really helps us.

Denso is a good O2 sensor, low price, and they work good. I suggest staying away from Bosch, I've heard several people say they last about a month.

2004 Chevy Impala. I updated my siggy, I'll work on making it as nice as yours once the car works

First one is a crank sensor, goes in a hole in the block. Trigger wheel is machined on the crankshaft.

3800 in NYC, i wouldnt expect much mileage even when working properly, these cars are geared to get good mileage on the highway.

aside from that it would be cool to drive i bet, maybe people would get out of my way if i had a 9c1.

It definitely does, people never pull the **** they did when I drove a little red Corolla (unsafe passing, uturns into intersections, other instances of obnoxiousness). Today I drove to a taco bell, and a truck was blocking, an NYPD patrol car stopped traffic so that I could wriggle my way into the parking lot. I don't know if the would've done that for anyone else...


Anyways, theres now a whine as I accelerate. Is that normal with a 3800 drivetrain? Or is it a worn belt?
Another new problem is the car was apparently shutting off as my dad was parking earlier. He swears its the oxygen sensor (haven't gotten it changed yet, will most likely do it tomorrow), I think otherwise. What do you guys think?

The whine could be a belt or ive seen when trannys get low on fluid they like to whine a little bit..or an inturruption in your air intake