Duncan and Son Lines

Clean Truck Check tester in Buckeye, AZ.

Duncan and Son Lines appears on CARB's public list of credentialed Clean Truck Check testers. It lists OBD testing.

Location
23860 W US Highway 85, Buckeye, AZ 85326
Phone
(602) 904-1110
Mobile testing
No (test at the shop)
OBD testing
Yes
Smoke opacity (non-OBD)
No
Motorhomes
No
Credentialed testers
1
Last verified

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Before you call

  • Have your VIN, odometer reading and plate number ready.
  • Your vehicle must be registered in CTC-VIS and the annual compliance fee paid; the tester submits the result to CARB.
  • Ask for the price per vehicle. Typical published prices for an OBD test are $50–$135 per vehicle (see cost guide).

Which trucks Duncan and Son Lines can test

The test CARB requires depends on the engine's fuel and model year. Based on the services Duncan and Son Lines lists on CARB's tester list:

Your vehicleTest requiredThis tester
Diesel, model year 2013 or newerOBD scanYes
Alternative fuel (natural gas, propane), 2018 or newerOBD scanYes
Diesel, model year 2012 or older (no OBD)Smoke opacity test (SAE J1667) plus visual inspectionNot listed
California-registered motorhomeSame test as above by engine year, once a yearNot listed

For a 2012 or older diesel, the nearest listed tester with smoke opacity testing is Xavier Villabol in Phoenix, about 33 miles away. See listing.

If you need a tester at your yard, the nearest listed tester that offers mobile testing is GEO Mobile Fleet Service in Goodyear, about 14 miles away. See listing.

Clean Truck Check testers in Arizona

Duncan and Son Lines is one of 43 testing businesses in Arizona on CARB's public tester list. 36 of them offer mobile testing and 9 do smoke opacity tests. Testers outside California.

When your truck is due

Most trucks test twice a year, on a schedule tied to the DMV registration expiration date. CARB says OBD trucks move to four tests a year beginning October 2027. California-registered (non-commercial) motorhomes and agricultural vehicles test once a year. See the deadline guide. You can test up to 90 days before a deadline. Get a free email reminder before each one.

How to check a tester's credential

CARB publishes its Clean Truck Check tester list, where Duncan and Son Lines appears as of November 1, 2026. Listing there is optional, so a missing name does not always mean a tester is not credentialed. After the test, check that the passing result shows for your vehicle in CTC-VIS; that is what counts for compliance.

Frequently asked questions

Does Duncan and Son Lines offer mobile Clean Truck Check testing?

Not according to CARB's tester list; plan to bring the truck to the tester. The nearest listed mobile tester is GEO Mobile Fleet Service (about 14 miles).

Can Duncan and Son Lines test a 2012 or older diesel truck?

Duncan and Son Lines does not list smoke opacity testing, which older non-OBD diesel trucks need. The nearest listed tester that does is Xavier Villabol (about 33 miles). Trucks from 2013 on get an OBD scan instead.

How much does Duncan and Son Lines charge for a Clean Truck Check?

Duncan and Son Lines has not published prices with us; call (602) 904-1110 for a quote. Published California prices are usually $50–$135 per vehicle for an OBD test and $190–$200 for a smoke opacity test, plus CARB's annual fee ($32.13 in 2026). See the cost guide.

Is Duncan and Son Lines a CARB-credentialed tester?

Duncan and Son Lines appears on CARB's public Clean Truck Check tester list, last checked November 1, 2026. Only credentialed testers can submit results to CARB; after the test, confirm the passing result shows for your vehicle in CTC-VIS.

Other testers near Buckeye

Source: CARB's public Clean Truck Check tester list, last checked . Listing on CARB's list is optional for testers, so some credentialed testers are not shown. Services, hours and prices change; please confirm with the tester before you go. Something wrong? Send a correction.

Call (602) 904-1110