The following list contains known or potential vehicle's which are not fully OBDII compliant and/or not compatible with UltraGauge v1.2 or later. If you have a UltraGauge prior to v1.2 (roughly pre July 4 2012), please see the corresponding pre-v1.2 exceptions list

STATUS
 
Confirmed - UltraGauge.com has confirmed this incompatibility
Unconfirmed - An UltraGauge customer has reported the issue.  The issue may actually be a problem specific to their vehicle and not to all like vehicles. This should be considered a warning and you should be prepared to re-task your UltraGauge to another vehicle if you experience the same problem.  If you can also confirm the problem, we would greatly appreciate it if you could alert support via the support ticket system found here: Support Ticket
?? Simply based upon previous years this vehicle may or may not be compatible. There have been no known reports of issues.

Diesel Vehicles:  Please see this knowledgebase article: Diesel Engines

Any vehicle with a multi-displacement engine that does not have a Mass Air Flow Sensor (MAF) will not measure MPG accurately, unless Multi-displacement is disabled via Auto-Stick or equivalent..  Learn about MAF here

INTERNATIONAL VEHICLES:   It is imperative that a target vehicle is confirmed to be OBDII Compliant. Once confirmed, then this exceptions list can be consulted. Please see the compatibility page for OBDII compliance

Returns received that were purchased for a vehicle on the exceptions list or one that does not have an emission label marked as OBDII certified or compliant, will incur a $15 refurbishment fee

Year
Make
Model
Engine Size
Status
Description
1996
Subaru
all
all
Unconfirmed
older Subaru's may have few gauges
Ford
E/F250/E/F350/E/F450
Diesel
Confirmed
Ford Diesels
1997
GM
Diesel
6.5L
Confirmed
No fuel or mileage gauges supported
Subaru
all
all
Unconfirmed
older Subaru's may have few gauges
Ford
Ranger
4.0L
Unconfirmed
Some 1997 Ford rangers always reports MPH=0. It appears that this it is likely a defect in the one reported vehicle. Several other installations in the same date code vehicle have not had issues.
See Dealer and mention Service Bulletin No. 99-26-4 and/or Operation 992604A
Ford
E/F250/E/F350/E/F450
Diesel
Confirmed
Ford Diesels
1998
GM
Diesel
6.5L
Confirmed
No fuel or mileage gauges supported
Ford
E/F250/E/F350/E/F450
Diesel
Confirmed
Ford Diesels
Ford
Ranger
3.0L
Confirmed
Vehicle always reports MPH=0.
See Dealer and mention Service Bulletin No. 99-26-4 and/or Operation 992604A
Land Rover
TD5
2.5L
Confirmed
TD5 2.5L engine Not OBDII compliant
Dodge/Chrysler
Caravan/Town & Country
3.8L
Confirmed
Vehicle does not support Engine Intake temperature.
This results in inaccurate fuel usage and MPG gauges.
1999
GM
Diesel
6.5L
Confirmed
No fuel or mileage gauges supported
Ford
E/F250/E/F350/E/F450
Diesel
Confirmed
Ford Diesels
Dodge/Chrysler
Caravan/Town & Country
3.8L
Confirmed
Vehicle does not support Engine Intake temperature.
This results in inaccurate fuel usage and MPG gauges.
Land Rover
TD5
2.5L
Confirmed
TD5 2.5L engine Not OBDII compliant
Dodge
Ram 3500
Diesel
confirmed
Supported, but very few gauges available.
2000
Ford
E/F250/E/F350/E/F450
Diesel
Confirmed
Ford Diesels
Dodge/Chrysler
Caravan/Town & Country
3.8L
Confirmed
Vehicle does not support Engine Intake temperature.
This results in inaccurate fuel usage and MPG gauges.
Land Rover
TD5
2.5L
Confirmed
TD5 2.5L engine Not OBDII compliant
2001
Toyota
Tacoma
Confirmed
6-Lug Tacomas with ABS click here for more information
Ford
E/F250/E/F350/E/F450
Diesel
Confirmed
Ford Diesels
Dodge/Chrysler
Caravan/Town & Country
3.8L
Confirmed
Vehicle does not support Engine Intake temperature.
This results in inaccurate fuel usage and MPG gauges.
Land Rover
TD5
2.5L
Confirmed
TD5 2.5L engine Not OBDII compliant
2002
Dodge/Chrysler
Caravan/Town & Country
3.8L
Confirmed
Vehicle does not support Engine Intake temperature.
This results in inaccurate fuel usage and MPG gauges.
Ford
E/F250/E/F350/E/F450
Diesel
Confirmed
Ford Diesels
Land Rover
TD5
2.5L
Confirmed
TD5 2.5L engine Not OBDII compliant
Toyota
Tacoma
Confirmed
6-Lug Tacomas with ABS click here for more information
2003
Dodge/Chrysler
Caravan/Town & Country
3.8L
Confirmed
Vehicle does not support Engine Intake temperature.
This results in inaccurate fuel usage and MPG gauges.
Ford
E/F250/E/F350/E/F450
Diesel
Confirmed
Ford Diesels
Land Rover
TD5
2.5L
Confirmed
TD5 2.5L engine Not OBDII compliant
Toyota
Tacoma
Confirmed
6-Lug Tacomas with ABS click here for more information
2004
Ford
E/F250/E/F350/E/F450
Diesel
Confirmed
Ford Diesels
Infinity
G35
Confirmed
Vehicle is not fully OBDII compliant as dash lights may become impaired. A 9141 Isolation cable may resolve this issue.... though this is not confirmed.
Toyota
Tacoma
Confirmed
6-Lug Tacomas with ABS click here for more information
Land Rover
TD5
2.5L
Confirmed
TD5 2.5L engine Not OBDII compliant
2005
Ford
E/F250/E/F350/E/F450
Diesel
Confirmed
Ford Diesels
Infinity
G35
Confirmed
Vehicle is not fully OBDII compliant as dash lights may become impaired. A 9141 Isolation cable may resolve this issue....though this is not confirmed.
Land Rover
TD5
2.5L
Confirmed
TD5 2.5L engine Not OBDII compliant
Toyota/Scion
1.5L
Unconfirmed
Very uncommon, may be same issue and solution as described here
2006
Ford
E/F250/E/F350/E/F450
Diesel
Confirmed
Ford Diesels
Land Rover
TD5
2.5L
Confirmed
TD5 2.5L engine Not OBDII compliant
2007
Ford
E/F250/E/F350/E/F450
Diesel
Confirmed
Ford Diesels
Toyota
 
1.8L
Unconfirmed
Very uncommon, may be same issue and solution as described here
2008
Ford
E/F250/E/F350/E/F450
Diesel
Confirmed
2009
Ford
E/F250/E/F350/E/F450
Diesel
Confirmed
2010
Chevy
Silverado
5.3L
unconfirmed
Occasional Engine Hesitation
Ford
E/F250/E/F350/E/F450
Diesel
unconfirmed
2011
Ford
E/F250/E/F350/E/F450
Diesel
unconfirmed
2012
Ford
E/F250/E/F350/E/F450
Diesel
??
2013
Ford
E/F250/E/F350/E/F450
Diesel
??
2014
Ford
E/F250/E/F350/E/F450
Diesel
??
2015
Mercedes Benz
Sprinter
Diesel
Confirmed
Must use the UltraGauge EM Plus v1.4
2016
Mercedes Benz
Sprinter
Diesel
Confirmed
Must use the UltraGauge EM Plus v1.4
2017
Mercedes Benz
Sprinter
Diesel
Confirmed
Must use the UltraGauge EM Plus v1.4
2018
Mercedes Benz
Sprinter
Diesel
unconfirmed
Must use the UltraGauge EM Plus v1.4