What needs to be done when VES/TRAC/check engine lights are lit up?

The Trac off and abs lights being on together are a related problem. With your check engine light on shop should be able to tell what is wrong. Go to AutoZone or similar and have them scanned the computer for codes then get a new shop

Good chance that either the switch itself is bad and only making connection when it feels like it. I'd also check the power supply to the switch and make sure any of the connectors aren't corroded.
Brake and signal lights are on their own circuit....that's why they still work. Personally, I'm betting on the switch.

Need the DTC code. Same code every time?

The rear sensor only monitors emissions, it does not control fuel mixture. Only the front ones do. frayed wires on the body harness are quite common since the O2 sensor moves as teh exhasut pipe shakes.

check the starter solenoid

Here is the basic maintenance list for your Jeep:

~ Inspect lights and check tire pressure at least monthly or before & after each trail ride

~ Oil & filter change, chassis lubrication, differential and transfer-case fluids every 3,000 to 5,000 miles or 3 to 4 months - if you have recently crossed through water deep enough to submerge the centre of your hubs, replace the differential fluids as a precaution

~ Underhood belt and hose inspection every 3,000 to 5,000 miles or 3 to 4 months (every oil change)

~ Tire rotation and wheel balancing every 6,000 miles or every other oil change - driving offroad can knock wheel weights off a wheel, so you may need to have this done more frequently

~ Brake inspection every 6,000 miles or every other oil change - if you have rum brakes in the rear, ensure they are cleaned after each trail ride where you encountered deep mud/snow

~ Replace air filter every 12,000 to 24,000 miles or as indicated by inspection - dusty trails can shorten these intervals dramatically

~ Replace fuel filter every 24,000 to 100,000 miles

~ Automatic transmission service every 24,000 to 100,000 miles

~ Wheel alignment check every 12,000 to 24,000 miles or as indicated by tire wear - offroad driving can knock wheels out of alignment, so budget for an alignment every 3 months, then watch tread wear to see if it's needed

~ Cooling system flush and refill every 40,000 to 100,000 miles

~ Belt and hose replacement every 60,000 to 100,000 miles or 5 to 8 years

~ Engine timing belt replacement every 60,000 to 100,000 miles (when equipped) or 5 to 8 years

~ Air conditioning performance check annually, usually in the spring - be sure to run your A/C during the winter for brief period to ensure all hoses and valves stay lubricated and operable

Battery was diconnected for 1 minute and then reconnected. All lights are off.

This is very common on Matrix/Corollas and is repairable by way of replacement PCM to correct invalid parameters. the labor is low but the part is very expensive.

Expect approximately $89 or less in labor, and $648 for the new PCM



Reference bulletin #TC015-07

The contents are below:

TRANSMISSION & CLUTCH
TC015-07 Title:
HARSH SHIFT AND M.I.L. "ON"
DTC P2716 Models:
'05 - '07 Corolla & Matrix (1ZZ-FE) September 20, 2007

Introduction
Some 2005 - 2007 model year Corolla and Matrix vehicles equipped with an automatic transaxle may exhibit a harsh shift condition and a M.l.L. ON" with DTC P2716 stored.
Improvements have been made to the Engine Control Module (ECM) (SAE term:
Powertrain Control Module/PCM) to reduce the possibility of this condition occurring.

Applicable Vehicles
^ 2005 - 2007 model year Corolla and Matrix (2WD) vehicles equipped with the 1ZZ-FE engine.
Warranty Information
Applicable Warranty*:
This repair is covered under the Toyota Federal Emissions Warranty. This warranty is in effect for 96 months or 80,000 miles, whichever occurs first, from the vehicle's in-service date.

check the abs sensors make sure they are connected. Also check your wheel bearings if faulty may cause these lights to come on.

this light indicate tha oil level is low in engine , make a service oil ,or check the level, this light have an sender in oil pan and could be dirty

A-Service — First visit at approximately 10,000 miles or 1 year, but determined by Flexible Service System; then every 20,000 miles or 2 years.
Interior
· Function check
· Check warning and indicator lamps, illumination and interior lighting
· Check windshield wiper, windshield washer system, headlamp cleaning system
· Reset maintenance service counter in instrument cluster

Wheels, brakes
· Check front brake pads for lining thickness
· Check tires for damage, condition
· Correct tire inflation pressure

Engine compartment
· Change engine oil and filter
· Fluid level checks of the following:
· Engine cooling system, antifreeze and corrosion protection
· Windshield washer system
· Brake system
· Check and correct battery fluid level
· Check battery condition
· Check catch, safety catch and hinges on engine hood for proper operation
Trunk
· Correct tire inflation pressure in spare tire
· Check battery condition

B-Service — First visit at approximately 20,000 miles or one year after previous service, but determined by Flexible Service System; then every 20,000 miles or 2 years.
Services performed:

Interior
· Function check
· Check warning and indicator lamps, illumination and interior lighting
· Check windshield wiper, windshield washer system, headlamp cleaning system
· Reset maintenance service counter in instrument cluster
· Replace dust filter (not applicable to SL-Class)
· Replace combination filter (SL-Class)
· Check parking brake (function test only)

Wheels, brakes
· Check condition/thickness of front and rear brake discs
· Check front and rear brake pads for lining thickness
· Check tires for damage and condition
· Measure tread depth, record in mm
· Correct tire inflation pressure

Underside of Vehicle
· Check for major components leakage
· Check for chafe marks, line routing, damaged components
· Check condition of front axle ball joints and rubber boots
· Check condition of mechanical steering components and rubber boots

Engine Compartment
· Check for major components leakage
· Check for chafe marks, line routing, damaged components
· Check and replenish all fluid levels
· Change engine oil and filter
· Check engine cooling system, antifreeze and corrosion protection
· Check brake system
· Check power steering
· Check Active Body Control
· Check windshield washer system
· Check and correct battery fluid level
· Check battery condition
· Check catch, safety catch and hinges on engine hood for proper operation
· Check condition of poly V-belt

Trunk
· Check battery condition
· Correct tire inflation pressure in spare tire