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Thread: New WBO2 sensor gone bad?

  1. #1

    Default New WBO2 sensor gone bad?

    I have a Dominator with two Bosch WBO2 sensors. All new stuff with about 150 miles on them. Last night I started the car to pull it in the garage and it stumbled and choked after about 30 seconds. After reviewing a few datalogs today I realized that my passenger side WBO2 sensor was pegged at 35.6 AFR with intermittent bursts of semi-normal readings (12.2 A/F). So I suspect it is either bad, or perhaps my connection is bad. I changed my "Wideband O2 Sensor setting" in System Parameters from "Average" to "Left Only" and the car ran perfectly again, confirming an issue with the driver's side WBO2.

    Near the center of Danny Cabral's "Wideband O2 Sensor Notes" post here, he suggests that this could happen due to moisture shock from bad mount angle or positioning. But I feel this is unlikely in my case, as I previously put 6,000 miles on the car over a 12 year period without issue with a Commander 950 and WBO2 in the same location. The only difference is that the Dominator system has an additional sensor in the opposite side pipe. (Note: I did not reuse the C950 WBO2 sensor, I purchased two new units for the Dominator.) Is it possible for a new WBO2 sensor to go bad within such a short time? Should I purchase a couple of HBX-1 Heat-Sink Bung Extenders to eliminate the possibility of heat/moisture damage? Here's a link to a datalog showing the issue. Thanks in advance!

  2. #2
    Join Date
    Dec 2009


    Quote Originally Posted by dalcini View Post
    Should I purchase a couple of HBX-1 Heat-Sink Bung Extenders to eliminate the possibility of heat/moisture damage?
    I always do.
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385" SBF, Dart SHP 8.2 block, TFS TW 11R 205 heads, 11.8:1 comp, TFS R-Series intake, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 160A 3G alternator, Optima Red battery, A/C, 100HP progressive dry direct-port NOS, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/off-road X-pipe/shorty headers, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/2800 RPM converter, M4602G aluminum driveshaft, FRPP 3.31 gears, Cobra Trac-Lok differential, Moser 31 spline axles, '04 Cobra 4-disc brakes, '93 Cobra booster & M/C, 5-lug Bullitt wheels & 245/45R17 tires.

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