Lambda Probes
The petrol engines have two or three lambda probes depending on the engine's emission rating. The B4204T10/T12 engines intended for markets which correspond to PZEV (Partial Zero Emission Vehicle) have three lambda probes. These engines also have two catalytic converter monoliths. The B4204T9/T11/T15 engines intended for other markets have two lambda probes and one catalytic converter monolith. The front lambda probe has, for all engine options, a linear signal characteristic, while the rear has binary. To provide a fast operating temperature, all lambda probes have a heating element which is controlled by the ECM. The lambda probes reach normal operating temperature within a few seconds.