Home

Diagnostic Trouble Code: B0055

Diagnostic Trouble Code Name: Side Airbag Deployment Commanded

Vehicle Make: Holden

Vehicle Model: Commodore (VE)

Diagnostic Code Entered By: ZerOne

Diagnostic Code Entered On: Wed Oct 06, 2010 11:00 pm

Please Note: The DTC Information provided has been randomly generated.

To view the correct Diagnostic Code Information, Please Login, or Register.

Diagnostic Trouble Code Description: 

Catalyst System Low Efficiency Bank 1

Possible Sensor Faults
ECM

Possible Related Diagnostic Trouble Codes
DTC P0420 or P0430 for the 2.8L, 3.0L, 3.2L, or 3.6L engine

Circuit / System Description
In order to maintain a reasonably low emission level of hydrocarbons (HC), carbon monoxide (CO), and oxides of nitrogen (NOx) a 3-way catalytic converter (TWC) is used. The catalyst within the converter promotes a chemical reaction that oxidizes the HC and CO present in the exhaust gas. This reaction converts the gases into harmless water vapor and carbon dioxide. The catalyst also reduces the NOx , converting the NOx into nitrogen. The engine control module (ECM) monitors this process using the post catalyst heated oxygen sensor (HO2S) signal. The post-catalyst HO2S located in the exhaust stream after the TWC, produces an output signal that indicates the oxygen storage capacity of the catalyst. The oxygen storage capacity (OSC) determines the ability of the catalyst to convert the exhaust emissions effectively. If the catalyst is functioning correctly, the post-catalyst HO2S signal will be far less active than the signal produced by the pre-catalyst HO2S.

To determine OSC, the ECM commands a rich air/fuel mixture until all oxygen is removed from the catalyst. The ECM then commands a lean air/fuel mixture and monitors the rear heated oxygen sensors to calculate the oxygen storage capacity. The catalyst is operated in this mode until one of the following conditions occur: