Water In O2 Sens: Check Eng.LT.On Momentary, Code 32 (11-40-93)

Publication date: 1993-02-05
Reference number: 11-40-93

WATER IN O2 SENS: CHECK ENG.LT.ON MOMENTARY, CODE 32

TECHNICAL SERVICE BULLETIN

Reference Number(s): 11-40-93, Date of Issue: February 5, 1993

CHECK ENGINE LIGHT MOMENTARY ILLUMINATION - TROUBLE CODE "32" OXYGEN SENSOR IN MEMORY

Model(s): 1990-91 Subaru Legacy (except Turbo)

Group: Electrical

Bulletin No.: 11-40-93

Date: February 5, 1993

SERVICE INFORMATION

Some 1990/91 Model Year non-turbo Subaru Legacy vehicles may experience water intrusion into the inside of the oxygen sensor from situations such as driving through standing water. This may result in the oxygen sensor not operating momentarily. Under this condition the electronic control unit (ECU) identifies and stores an oxygen sensor failure code and illuminates the "CHECK ENGINE" light.

During continued vehicle operations the entrapped water is vaporized and is emitted into the atmosphere, which results in the oxygen sensor reverting to normal operating condition and the "CHECK ENGINE" light being turned off. The "false" failure code is retained in the ECU memory. Use the following trouble tree to identify the trouble code causes.

Fig 1: TROUBLE CODE FLOWCHART

CLEAR MEMORY MODE

Fig 2: CLEAR MEMORY MODE FLOWCHART

D-CHECK MODE

Fig 3: D-CHECK MODE FLOWCHART