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Thread: WBO2 Sensor Problem

  1. #1

    Default WBO2 Sensor Problem

    I got my car running a day ago. I have an AEM wideband in one bank, and the Dominator NTK one in the other bank. I noticed the two were like 2 full points off, almost right away. Now a day later, the thing just sits at 35.9 AFR. Is there a calibration or anything?

  2. #2
    Join Date
    Dec 2009


    Quote Originally Posted by TurboTim View Post
    Is there a calibration or anything?
    The Holley WBO2 sensors are not calibrated by the end user.
    If you think the WBO2 sensor is defective, contact Holley Tech Service (LINK).

    Is this with the key-on/engine-off, or with the engine running?
    At key-on (initializing) and heating, the WBO2 sensor "LED" status indicator is yellow.
    Then there shouldn't be any "LED" status indicator at all (especially when engine is running).
    The WBO2 sensor heating cycle will time-out (key-on/engine-off) if the engine isn't started.
    When the WBO2 sensor heating cycle times-out (key-on/engine-off), it will display "init". (Ensure battery is fully charged!) (Sensor Diagnostics & Statuses) (Wideband O2 Sensor Information) (Read "Potential Causes of L & R Bank AFR Differences")

    Key-on/engine-off & cold, the NTK WBO2 sensor displays about 29:1 AFR. The Bosch WBO2 sensor displays about 35:1 AFR.
    After turning the engine off, exhaust gases need to dissipate before seeing these full lean AFRs (key-on/engine-off & cold).

    There's a WBO2 sensor testing procedure at the end of "Wideband O2 Sensor Notes": (WBO2 Sensor Information)
    Key-on/engine-off. Also, the sensor heater will time out, so you'll need to work fast.
    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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