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.
DTC P0432/16806 - Main Catalyst Efficiency Below Threshold (Bank 2)
1996 Audi A4 Base, StandardSECTION DTC P0432/16806 - Main Catalyst Efficiency Below Threshold (Bank 2)
NOTE:
PCM uses HO2S in front of, and behind 3-way catalyst to determine deterioration of 3-way catalyst using oxygen storage capability of catalyst.
- Bank 2 3-way catalyst is located on driver side of vehicle. If no other DTCs are set in memory, go to next step. If any other DTCs are set in memory, perform testing for other DTCs first. If after repairing other DTCs and clearing codes, this DTC returns, go to next step.
- Possible cause for DTC may be catalyst is chemically or thermally aged or mechanically damaged. Replace 3-way catalyst. Erase DTC memory and test drive vehicle.
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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.