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.
2021 Chevrolet Tahoe SSVFACTORY OEM SERVICE PROCEDURE
Nitrogen Oxide Control Module: Remove & Replace
WARNING: This page is about the Tahoe High Country, 3.0L Eng VIN T, 4WD, which is a different variant/trim than selected.
EXHAUST AFTERTREATMENT SYSTEM
NOTE: Labor estimates listed are for R&R only and DOES NOT include diagnosis time.| Applies To | Note | Standard Hours | Warranty Hours | Skill Level |
|---|---|---|---|---|
| 3.0L Eng, Position 1 | 0.6 | 0.4 | B | |
| 3.0L Eng, Position 2 | 0.6 | 0.5 | B | |
| 3.0L Eng, Position 3 | 0.6 | 0.5 | B | |
| Combination Procedure: NITROGEN OXIDE SENSOR: Reset: | ||||
| 3.0L Eng | Includes: Additional time for use of scan tool to perform this procedure. | 0.2 | B | |
Factory Service Tools
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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.