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Find Repair Location
Get an Estimate
Check for Recalls
Your Car
Car Basics
Car Overview
Getting to know your car
Car Care Advice
Basics of repair and maintenance
Car Parts
Definitions and terms for car parts
Tires
A comprehensive guide to tires
Troubleshooting
Symptoms Guide
Get solutions to common issues
Common Problems
Find the most common problems
Questions Forum
Get answers to your car questions
OBD-II Codes
Find out what your codes mean
Scheduled Maintenance
Understand your upcoming services
Car Research

For Business
- About Certification
  Learn about our certification process
- Shop Owners
  Get new customers and build trust
- Dealership Fixed Ops
  Tools to generate more profit
- Dashboard Login
  Are you interested in certification?
  Schedule a Demo
Your car, services, and appointments in one place.

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Popular Answer

Why is my NOx so high

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I passed everything on my emissions but my NOx was real high

GoldieGucci in Aurora CO

Dec 2, 2015

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Auto Works ATXon Dec 3, 2015

NOx is caused by high combustion temps. Possible causes are faulty EGR system or even excessive carbon buildup in the combustion chambers.

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Popular Answer

Auto Works ATXon Dec 3, 2015

NOx is caused by high combustion temps. Possible causes are faulty EGR system or even excessive carbon buildup in the combustion chambers.

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