In many places, emissions and smog tests are mandatory to ensure vehicles do not emit damaging gases. After getting an EGR delete kit, many drivers ask if their vehicle can still pass emissions and smog tests. Here is an explanation of the EGR system, current laws, and the effects of EGR deletes.
What is an EGR Delete?
EGR system delete is the removal or disabling of the EGR system. This is done using a special kit.
- The intended purpose is better performance, better fuel economy, and extended engine life.
- Along with performance enhancements, many drivers also report less engine carbon buildup after EGR deletion.
Regardless of the performance enhancements and engine carbon buildup, legally compliant emissions must still be maintained.
Can a Car Pass Emissions if the EGR is Removed?
Most of the time, a vehicle will not pass emissions or smog testing after an EGR delete. Here’s the reasons:
- Higher Emissions - NOx gases will be more plentiful in the atmosphere without an EGR. This is easily seen by the testing equipment.
- OBD Systems Report Faults - Most modern test facilities will use OBD (On Board Diagnostics) systems. If the EGR system is removed, the OBD system will probably throw a fault.
- Missing Visuals - In the locations where they do not use OBD systems, they will check under the hood. Technicians will notice the EGR system is missing.
To sum it up, it will be very hard to pass an official emissions or smog test if the EGR system is removed.
Where the EGR Delete Does Not Matter
In some of the more rural regions around the world, or regions that do not have emissions related laws, drivers do not have to complete regular smog checks. In this situation, an EGR delete will not impact the inspection results because there is no emissions test to complete.
Most places around the world, specifically the United States, Canada, and Europe, require emissions testing, and they will fail without an EGR.
Legal and Environmental Considerations
An EGR delete is often illegal for street vehicles. Government agencies view EGR deletes as modifications that increase pollution. In some jurisdictions, vehicles without the legally required emissions control systems can incur hefty fines.
Environmentally, EGR systems can be legally removed, resulting in higher emissions of NOx gases, and poor air quality that can adversely affect public health.
EGR Deletes Alternatives
Emissions compliant performance EGR deletes can be legally used in the following ways
- Routine EGR Cleaning– Restores function to the EGR systems.
- Top Tier Fuel and Engine Additives- Engine cleaning and the problem minimization help performance.
- EGR Tuning- Power can be added without EGR deletes and emissions control systems removed by professional tuners.
There are no EGR deletes in this case.
Bottom Line
Installing an EGR delete kit may improve performance and reduce maintenance issues inside the engine. However, in most regions, a vehicle will not pass emissions or smog testing after an EGR delete. For drivers living in areas with strict testing, keeping the EGR system or using legal alternatives is the smarter choice.
FAQs
1. What happens if a car fails a smog test because of an EGR delete?
If a car fails a smog test, it cannot be legally registered until it is fixed.
2. Can I reinstall the EGR system and EGR cooler before a test?
Yes, but it should be functioning properly and needs to be in an operational state without any trouble codes. Just putting the parts back may not help because the sensors may trigger an inspection.
3. Is it legal to perform an EGR delete everywhere?
No. Not in a lot of jurisdictions or nations. You should always check the regulations in your area.
4. Do EGR deletes improve horsepower?
Most drivers report increased throttle responsiveness with more power, but it results in more emissions.
5. Do any emissions-compliant performance parts exist?
Yes. There are many aftermarket parts intended to enhance performance while still keeping to emissions standards and regulations. In the U.S. these are typically marketed as “CARB-compliant”.