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2001 XLS error codes #1103574 06/27/17 10:58 PM
Joined: Apr 2004
Posts: 2,700
grass13 Offline OP
Roll Me Over
Long time no speak gentlemen. On our 2001 XLS we got some error codes during a recent road trip. Fuel trim for bank 1 and 2, codes P0170 and P0173. On top of those we got code P0125 for insufficient coolant temp. They came up while pulling a pass and she runs as awesome as ever, never a hint of a problem. Coolant levels are good but it has been a while since a full tune. She just turned over 215k miles and I'm hoping this isn't the beginning of the end because she's been such a great car. Any thoughts on what the cause could be from the gurus?
PS hi Ray long time no visit!

98' BBJ Grand Laredo 5.2 locked and loaded,.01' Gen III XLS. Frankenmonty lives on in another.
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Re: 2001 XLS error codes [Re: grass13] #1103575 06/28/17 10:23 AM
Joined: Mar 2005
Posts: 1,006
pcc Offline
Body Damage is Cool
Hows the heat gauge? Lower than normal? If engine heat OK then you should check the ECT sensor for proper operation. You can OHM it when engine cold and when engine hot then check resistance against spec. If it is telling computer engine is cold then you'll get rich run when hot. The fuel trims will attempt to compensate but the codes mean they're at the max.

Last edited by pcc; 06/28/17 10:23 AM.

92 Montero LS 3.0L V6 Auto, Stock, Original owner, 185,800K miles
Re: 2001 XLS error codes [Re: grass13] #1103576 06/28/17 03:08 PM
Joined: Feb 2000
Posts: 6,231
4x4Wire Offline
Trail Leader
"Insufficient cooling temp"...

As in engine is running lower temp than required for proper operation of a fuel injected system?

Might want to check your thermostats for proper operation. Coolant in a constant recycle will not come up to full temp, generall 190-200 degrees.

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