Engine Controls - MIL ON/Fault Code 2096 Stored
SI M 12 01 06
Engine Electrical Systems
December 2006
Technical Service
This Service Information bulletin supersedes S.I. M12 01 06 August 2006.
[NEW] designates changes to this revision
SUBJECT
EMS2K FC 2096 - Post-cat Oxygen Sensor Lean Mixture
MODEL
R50 W10, R53 W11 with EMS2K
SITUATION
2002-2006 Mini Cooper (R50) L4-1.6L (W10) Page 269
Check Engine Light is illuminated and the DME fault code 2096 - "02 sensor bank 1 after catalyst, exhaust gas composition indicates lean mixture -
currently present" is stored.
CORRECTION
The post-cat 02 sensor FC 2096 is only an indication of a lean mixture condition; the oxygen sensor is not a root cause of the fault.
1. Follow the appropriate GT1/DIS test plan modules.
2. Check long-term multiplicative adaptation values (in most cases, readings are in the range of positive 5%-7%, indicating a lean mixture
problem).
3. [NEW] Perform basic diagnostic of the intake air filter, intake system, fuel delivery, and exhaust systems. Look for vacuum leaks in the intake
manifold, supercharger boots, by-pass valve, etc. Check for leaks in the exhaust manifold and catalytic converter area (preferably by using a
diagnostic smoke machine). Check fuel pressure, swap MAP/TMAP sensors, swap injectors from a known good car and observe changes to
the short-term adaptation values. Perform appropriate repairs as needed.
4. Reset long-term adaptation values.
5. Perform post-cat 02 sensor test to verify effectiveness of the repair (the specified post-cat 02 voltage should be in the range of 500-700 mV
after 5 minutes of engine idling).
6. Provide feedback via PuMA case.
IMPORTANT:
To dear the DME short4ong term mixture adaptations:
1. From the GT1/DIS select "Function Section", then
2. Select "Service functions", "Drive", "DME Motor Electronics", and then "Reset adaptations".
3. Go to "Test plan" and then right arrow.
4. From the menu of adaptation resets, select number 9. "All previous values" and press enter. Selection number 4. "Mixture adaptation" does
NOT dear mixture values.
WARRANTY INFORMATION
Covered under the terms of the MINI New Vehicle Limited Warranty.
Defect Code Refer to KSD
Labor Operation: Refer to KSD
Labor Allowance: Refer to KSD
