Hey there, so I am getting codes P0171, P0174, and P1151 on my 98.5 Contour SE 2.5L MTX. The CEL used to come on intermittently then go off, recently, it's just on, so I pulled the codes and that's what I got. Knowing cars and especially Fords very well, I realize that the codes suggest something else... like a dirty or bad MAF or vacuum leak. I cleaned out the MAF, checked for vacuum leaks, nothing changed... codes still came right back. I decided to clear the EEC's memory to kill adaptive and start over... well that was a very interesting thing actually. When I started the car, there was a good amount of exhaust fumes (white cloud) coming out and it smelled very strongly of spray paint which means (if I remember this correctly) that the exhaust mixture was ridiculously rich. I was watching the activity of my O2's and the downstreams were completely dead (.000) and one of the upstreams looked normal with quick switching, the other with very slow switching, and not that much change... at this time, the smell and cloud is getting ridiculous, so I took the car out to heat them up (sounds crazy to drive it like that, but heating up the O2's quite often wakes them up)... and sure enough, the O2's heated up at least enough to wake up the sensors. I was watching them and basically both downstreams are shot from the looks of it... one barely reads, the other is VERY slow switching if anything really, and at a very low voltage. The other (bad one) is also extremely slow switching which quite often isn't enough to throw a code but enough to cause issues and contribute to bad gas mileage.
So the bad O2 sensor list looks something like this...
B1S2
B2S1
B2S2
The short term and long term fuel trims are completely pegged out at fattening the mixture up, and as a result my fuel economy is shot. I've had O2's go bad on this car constantly... not sure why or what the design flaw is, but I've never seen a car "eat" O2 sensors quite like a Contour. Mind you, I have stock exhaust too. So my question is where can I get O2's for a decent price... the whole 65-upstream and 70-downstream is going to be quite a big hit here... any advise on where to get a decent price on O2's? Thanx guys, I appreciate it.
So the bad O2 sensor list looks something like this...
B1S2
B2S1
B2S2
The short term and long term fuel trims are completely pegged out at fattening the mixture up, and as a result my fuel economy is shot. I've had O2's go bad on this car constantly... not sure why or what the design flaw is, but I've never seen a car "eat" O2 sensors quite like a Contour. Mind you, I have stock exhaust too. So my question is where can I get O2's for a decent price... the whole 65-upstream and 70-downstream is going to be quite a big hit here... any advise on where to get a decent price on O2's? Thanx guys, I appreciate it.