Lambda sensor R&R and SRS light on.

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Top of pagePrevious messageNext messageBottom of pageLink to this message   By blake monchilovich on Wednesday, July 18, 2001 - 03:14 am: Edit

Hello all,

My '94 Disco wants to test my technical acumen once again. It's running really rough at idle/low revs but slightly better when out of gear. Dealer says it's a 'Lamda sensor slow response' and needs replacing for $400+. Is this pretty easy? How do I know which one is bad? Also, on the same day, the SRS light in the dash stays lit. Any ideas here?

Thanks,

Blake

Top of pagePrevious messageNext messageBottom of pageLink to this message   By Alex Schubow (Alex) on Wednesday, July 18, 2001 - 03:04 pm: Edit

This probably won't help much, but unless your computer is storing a code, the only way to pinpoint a lazy sensor (other then just trying both of them until you get the right one) is with Testbook (Dealer testing eqiupment).

On newer vehicles (96+) you can use an OBDII scanner to test the O2 sensors to see how quickly they respond--this makes it pretty simple.

Alex

Top of pagePrevious messageNext messageBottom of pageLink to this message   By Andrew Vick (Afv) on Wednesday, July 18, 2001 - 04:15 pm: Edit

Is a code registering? (under the front passenger seat, code 44 or 45?) If the code is there, and you can't reset, the sensor is probably bad, as I've recently learned. 44 or 45 will tell you which side is bad, and the sensor can be ordered from Nathan Crabtree for $89.

Top of pagePrevious messageNext messageBottom of pageLink to this message   By blake on Wednesday, July 18, 2001 - 05:37 pm: Edit

Thanks for the feedback.

Top of pagePrevious messageNext messageBottom of pageLink to this message   By blake on Wednesday, July 18, 2001 - 05:56 pm: Edit

Sorry, forgot to add: code is 44, not sure what side this is and how do you reset the code box - couldn't find it on this site.

Thanks again.

Top of pagePrevious messageNext messageBottom of pageLink to this message   By Andrew Vick (Afv) on Thursday, July 19, 2001 - 12:44 am: Edit

Do a search on this site on codes, and you'll find the link to this site. Here's the part you're looking for:

NAS Discovery's have a digital readout for diagnostics. It is a black plastic box measuring approximately 1" x 2.5" x 3" with a red LED readout. It is found under the passenger seat facing backwards. It may be unclipped and moved so that the driver can see it.
This doesn't give nearly as detailed readout at the official test box, but it's better than nothing. :)
Fault Codes
General:
The fault codes are given in order of priority. If more than 1 fault exists, you have to clear the display before the next fault code can be displayed.

Clearing the display
Switch ignition on.
Disconnect serial link mating plug, wait 5 seconds, then reconnect.
Switch ignition off, wait for main relay to drop out.
Switch ignition on. The display should now be reset. If there are other faults, the next one will be displayed. Otherwise the display will be black
If there is more than one fault repeat steps 1 to 4, to clear each fault until the display is blank.
No LED's are on:
Good news; nothing is wrong. Either that or Mr. Lucas has struck and either the LEDs are burned out or the display isn't getting any power.

Code 44 - Lambda sensor A - left bank
Code 45 - Lambda sensor B - right bank
If one of these fault codes is displayed check the wiring to that particular lambda sensor.

If both codes are displayed, the voltage supply to the heater coils of the sensors must be checked.


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