Quote:
Originally Posted by deanyel
Not sure what Arthur thinks but Doc once wrote that Bosch universals are fine for OBDI cars. You just have to check the price of both and see if it's worth it to you. It's located on the top of the exhaust pipe pretty much right underneath the console with the wiring going into the passenger footwell / 22 mm open end wrench.
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The jury is still out on Uni sensors....but the Bosch replacement seem to be OK.
.........here is the rub with the UNI sensors when used on the 124.032 HFM/SFI sytems [ The posters chassis , by the way]..
When one gets an 02 sensor code COUPLED with an AIR code on this system, [ the posters condition, by the way] , it indicates that the 02 sensor is no longer capable of attaining the extra lean [ low voltage ] readings required by the ECU self test for the AIR sustem. The AIR system uses the 02 signal to monitor the working of the AIR system. The ECU sends a self test signal to the AIR system when the cars coolant temp is up and it then looks at the 02 sig to see if the exhaust goes extra LEAN. If the report does not come back as such, then the DM [ led/sw N59 module ] brings on a code to notify the driver by popping the CE lamp and an AIR code #4. . So, is the AIR sustem not coming On and operating as it should ??? ..OR ..is the 02 not detetcting the extra lean condition cause by the AIR system activation..???
Now , if the other code is 2 , then we have a suspect 02 sensor heater circuit, which will not only pop an 02 code, but it will be coupled with an AIR code , even tho there is nothing wrong with the AIR system.
So. those who know these sysytems start their diagnosis with the LONE 02 sensor of this system by checking both the heater circuit of the sensor and the V readings of the sensor.
The problem w/uni sensors is many are not capable of the extra low readings required to monitor the AIR system and some will still bring On an AIR code right our of the box.
12-11-2008, 06:35 PM
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