Post Catalyst Fuel Trim System Low Limit Bank 2
Table of contents
P2098 SUZUKI Possible Causes
- Low fuel pressure
- Misfire condition
- Large vacuum leak
- Exhaust leaks near the Heated Oxygen Sensors (HO2S)
- Plugged catalytic converter
- Lean air/fuel ratio
- Faulty Rear Heated Oxygen Sensors (HO2S)
How do I fix code P2098 SUZUKI?
Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector’s pins.
Cost of diagnosing the P2098 SUZUKI code
The cost of diagnosing the P2098 SUZUKI code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle’s make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.
Possible Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
P2098 SUZUKI Description
The Heated Oxygen Sensors (HO2S) are used for fuel control and catalyst monitoring. Each HO2S compares the oxygen content of the surrounding air with the oxygen content of the exhaust stream. When the engine is started, the control module operates in an Open Loop mode, ignoring the HO2S signal voltage while calculating the air-to-fuel ratio. The control module supplies the HO2S with a reference, or bias voltage of about 450 mV. While the engine runs, the HO2S heats up and begins to generate a voltage within a range of 0-1,000 mV. This voltage will fluctuate above and below the bias voltage. Once sufficient HO2S voltage fluctuation is observed by the control module, Closed Loop is entered. The control module uses the HO2S voltage to determine the air-to-fuel ratio. An HO2S voltage that increases above bias voltage toward 1,000 mV indicates a rich fuel mixture. An HO2S voltage that decreases below bias voltage toward 0 mV indicates a lean fuel mixture.
The heating elements inside each HO2S heat the sensor to bring the sensor up to operating conditions faster. This allows the system to enter Closed Loop earlier and the control module to calculate the air-to-fuel ratio sooner.
Fuel trim bias is used by the Engine Control Module (ECM) to keep the post catalyst HO2S voltage within a range of 580-665 mV. This allows optimal catalyst efficiency under light load conditions, such as at idle or a steady cruise. The ECM constantly monitors how lean or rich the fuel trim bias is commanded, to determine if the fuel trim bias is greater than a calibrated amount.
The Diagnostic Trouble Code (DTC) will set if the post catalyst fuel trim correction factor is biased lean by more than 8 percent of the HO2S signal value for more than 4 seconds or for a cumulative of 50 seconds.