Upstream lambda sensor operation check
- Make
- Alfa Romeo
- Model
- GT Factory Service Manual
- Year
- 2003–2010
- Section
- Exhaust emission control system › Upstream lambda sensor operation check
EngineUpstream lambda sensor operation check
UPSTREAM LAMBDA SENSOR OPERATION CHECK
Disconnect the negative battery terminal
- Disconnect the negative battery terminal.
- Disconnect the electrical connection for the upstream Lambda sensor.
- Check that the heater resistance measured between pins 3 and 4 is between 3.5 and 4.5 Ohm at 20 °C.
Disconnect the electrical connection for the upstream Lambda sensor
| Description | Connector | |
|---|---|---|
| Lambda sensor downstream of the post-converter | See K17 LAMBDA SENSOR DOWNSTREAM OF POST-CATALYZER ( ENGINE ) |
Check that the heater resistance corresponds to the recommended value
| Measurement | Value | ||
|---|---|---|---|
| Heater resistance (ohm) | Pins 3 - 4 at 20°C | 4.0 ± 0.5 |
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