Originally posted by brett64:
I replaced the bank 2 sensor because the shop that installed a new clutch, etc. pinched the wire and it was measuring 5.8 ohms. I figured that it was sending a low signal back to the PCM which was richening the fuel mixture then causing the PO172 code. So while I was under the car one day I decided to switch the two.
The freeze frame I have is:
RPM 2713
CALC Load % 12.2
Coolant temp. 183
LT FTRM 1 % -24.2
ST FTRM 1 % -6.3
LT FTRM 2 % -18.8
ST FTRM 2 % -7.0
Veh. speed 45
Fuel sys 1 CLSD
Fuel sys 2 N/A
I don't have a clue what all this means.



I suspect your thermostat is stuck on open and hence keeping the engine cool or ECT sensor is broken (connector/wire broken). The thermostat is supposed to open at 195 F. It appears that it opened much earlier and then the engine went to closed loop. At that time, the engine was still running rich. The PCM usuallly ignores the rich condition when the engine is in open loop but in your case, it was just enough to go to closed loop. If you look at the Bank 2 Long Term Fuel Trim, it is also on the high side. With continued driving, you will also get a P0175 (Bank 2 rich condition). I would check/change the the thermostat and/or ECT sensor.

Thermostat ($12)
http://www.autozone.com/servlet/UiBroker?ForwardPage=/az/cds/en_us/0900823d/80/1b/c8/7d/0900823d801bc87d.jsp

Test the ECT sensor ($17).
http://www.autozone.com/servlet/UiBroker?ForwardPage=/az/cds/en_us/0900823d/80/1b/ca/ba/0900823d801bcaba.jsp

Location of ECT sensor
Check the wiring at the connector first.

Here is a post from Chongo. It highlights the ECT sensor.

Originally posted by chongo:
Did someone call me out.......LOL

here you go.



Last edited by Tony2005; 07/23/06 02:33 AM.
"Always do the cheap and easy ones first." 1996 V6 ATX 96K miles