Vehicle:
2007 MINI Cooper, BASE 1.6
Complaint:
Loses power between 30-40 mph for a couple of seconds. Also, seems like other things “power down.” A/C blower drops down, and once the engine picks back up, the CEL flashes once.
Diagnostic Steps Performed/Parts Replaced:
Replaced alternator after it had failed a ripple test. Several codes set, and unable to find information on these codes to reset them.
Cause:
Common connections for systems covered by the codes led to discovery of corrosion in the grounds near the passenger-side fuse block and chassis grounds.
Correction:
Cleaned and treated all grounds and connections to that fuse block and cleared all codes. All symptoms disappeared.
Courtesy of Mitchell 1 SureTrack Real Fix