TITU Events

About Tune In & Tune Up

The San Joaquin Valley is home to a large number of older cars, many of which are not registered because they do not meet state emissions standards. The goal of Tune In & Tune Up is to provide free smog repairs in order to renew vehicle registration for these cars.

Thanks to the sponsorship of the San Joaquin Valley Air Pollution Control District, Valley CAN hosts 24 Tune In & Tune Up events annually throughout the San Joaquin Valley. Tune In & Tune Up events are a welcoming, no-questions-asked venue where all Valley residents can get a free emissions test to determine whether their vehicle qualifies for free repairs at a local STAR-certified smog shop.

How it Works

If you are a San Joaquin Valley resident and you think your vehicle is in need of smog related repairs, bring it to the next scheduled Tune In & Tune Up event in your area for a free emissions test.

If your vehicle fails our emissions test, you get a $500 voucher for emission-related repairs at a local STAR-certified smog shop. The $500 can only be used for diagnostics, smog testing, smog repair work, and certification.

We are only concerned about your vehicle emissions, not your personal life, so any data we collect is only used for internal reporting and is not shared with outside agencies.

Have questions?
Please visit our FAQ page for more details.
Also check out our YouTube videos to see what to expect at an event!

Tune In & Tune Up Program Impact

Since 2005, 70,000 low-income disadvantaged community residents have come to Tune In & Tune Up smog events throughout the San Joaquin Valley, resulting in repairs to 30,000 high-emitting vehicles.  More than half of these vehicles were unregistered before undergoing necessary repairs to become smog compliant.

Biweekly Tune-in & Tune-up events provide free emissions tests for 400-525 vehicles 80% of vehicles fail emissions tests and receive repair vouchers up to $850 94% of our customers reside within disadvantaged communities
(SB 535 ZIP codes)
75% of vouchers are redeemed at STAR-certified smog shops 54% of customer vehicles are unregistered 98% of unregistered vehicles complete DMV registration after attending our events and completing repairs


The program efficiently converts program funds into quantifiable emissions reductions.

$1 million in Tune In & Tune Up spending produces 1,150 repairs resulting in approximate annual reductions of:

65 tons CO 8.5 tons HC 7 tons NOx

Cost-effectiveness for all three criteria pollutant gasses is approximately $8,000 per ton. Tune In & Tune Up has been shown to be among the most cost-effective methods to reduce vehicle emissions in California.