Auto Repair & Maintenance

​​​Good Brakes Automotive

We Guarantee Our Work


12614 N Cave Creek Rd Suite 104

Phoenix, AZ 85022

Emissions Repair & Testing ADEQ

Call Mike At 602-569-1162

Most Common
There are many components that if not working properly, can cause high emissions or an emissions failures. You can study and read about them individually to get better understanding of what they do and how they work.The systems are designed to reduce the emissions . If any of these emissions components fail, emissions can increase. Other components such as spark plugs, plug wires, and filters can also increase emissions if defective or not service at failure .  Hydrocarbons,  Carbon Monoxide  and Oxides of Nitrogen are measured in an emissions test. The state and federal government place certain limits on each of these harmful gases emitted. Carbon Dioxide is also measured, When the measured gases from the vehicle exceed the state or federal limits, the vehicle fails the the  test.

Diagnosis of high emissions can be an involved process that usually requires special tools and some time very complicated equipment to measuring devises & sensors. If the vehicle failed as a result of high CO and HC,  If the “Service Engine Soon” or “Check Engine” light is on it should be diagnosed by qualified shop . listed below are some of the causes
– Oxygen Sensor

–  Thermostat (cooling system), thermostat stuck open

– Oil contaminated with fuel, excessive miles between oil changes
–  Air Injection System (if equipped)
–  Air filter (especially if high CO is present only at high RPM)
– Vacuum leaks resulting in improper MAP sensor operation
– Air mass or air flow sensor

– Fuel Injectors
– Fuel evaporation system or purge valve
–  Catalytic Converter

HC Failure   is the result of incomplete combustion. Any item that causes incomplete combustion can result in high HC. The most common causes are:

– Defective spark plug wires
– Worn distributor cap and/or rotor
- Jumped Ignition timing or timing belt
– Vacuum leaks

– Worn spark plugs
– Engine mechanical failure, low compression, worn valves, excessive oil consumption

NOX Failure  is the result of combustion temperatures that are too high. The most common causes are:

– Exhaust Gas Recirculation System
– Cooling system malfunction, engine running too hot (restricted radiator, defective thermostat, etc.)
– advanced ignition timing
– Excessively lean air fuel mixture (defective oxygen sensor, MAP sensor or Air Mass Sensor)
-  Fuel injector clogging

If the engine is due for a tune up it is wise to perform preventative maintenance prior to spending too much time diagnosing the emissions problem. Proper vehicle maintenance can go a long way in keeping a vehicle’s emissions within specifications. A complete tune-up should consist of: spark plugs,distributor  cap and rotor, spark plug wires, air filter, fuel filter, and oil change. Although performing this service is not promised of a passed emissions test, it increases the likely hood . keep maintenance up to date and this will definitely keep your car emissions low.. Good Brakes Automotive Test And Diagnosis of Emission failures fast accurate .

Good Brakes Automotive Does ADEQ Emission Testing & Repairs