Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Unique Calibration
The Emission/CAFE/CO2 Compliance Department is responsible for assigning calibration numbers. Unique calibration identifications are assigned to cover similar vehicles to differentiate tires, drive configurations, final drive ratios and other significant certification factors.
These 2 characters are chosen by the analyst to provide identifiable information unique to each calibration. For example, using the number 2 to denote a 2-valve engine and 4 to denote a 4-valve engine, provides an easily identifiable difference.
Fleet Code
- 0 - Certification (U.S. 4K, final sale in export markets)
- 1 - HDGE/Dyno
- 2 - Fast AMA, U.S.
- 3 - ADP U.S.
- 4 - Not assigned
- 5 - Not assigned
- 6 - Evaporative emissions
- 7 - MACAA
- 8 - On-board diagnostics (OBD)
- 9 - Not assigned
Certification Region
- Certification region - Lead code where multiple regions are included in one calibration
- 5 - U.S. 50 states
- A - U.S. Federal (including altitude, may include Canada or Mexico)
- B - U.S. California standard (includes U.S. green states)
- C - Canada
- D - China
- E - European Community (Austria, Belgium, Denmark, Finland, France, Germany, Greece, Ireland, Luxembourg, Netherlands, Portugal, Spain, Sweden and United Kingdom)
- F - Extended European Community (E plus Croatia, Czech Republic, Estonia, Hungary, Norway, Poland, Romania, Russian Federation, Slovakia, Slovenia, Switzerland and Yugoslavia)
- G - Gulf Cooperative Council
- H - Hong Kong
- J - Japan
- K - Korea
- L - Malaysia
- M - Mexico
- N - New Zealand
- P - Australia
- Q - South America (Brazil)
- S - Singapore
- T - Taiwan
- U - South America (unleaded fuel)
- V - Vietnam
- X - ROW (rest of world)
- Y - Military
- Z - Israel
Revision Level (not printed on label)
- 91-99 - Hardware and certification level
- 01-04 - Preliminary levels
- 00 - Job 1 production (initial calibration)
- 05-09 - Pre-job 1 revisions to calibrations
- 10-89 - Post-job 1 revisions to calibrations
- 0B - Durability test level
- BD - On-board diagnostics (OBD) intermediate level (pre-05)
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.