DTC P0153 HO2S Slow Response Bank 2 Sensor 1. Cadillac Seville 2000

For 1990-2009 cars only

Makes 🢒 Cadillac 🢒 2000 🢒 Seville 🢒 DTC 🢒 DTC P0153 HO2S Slow Response Bank 2 Sensor 1

Engine Controls Component Views
HO2S
OBD II Symbol Description Notice
Handling ESD Sensitive Parts Notice

Circuit Description

The HO2S is a sensor used to detect oxygen-content in the exhaust. The PCM supplies the sensor with a signal circuit and a ground circuit. The PCM supplies a bias voltage between the circuits. The sensor varies the voltage based on the oxygen content in the exhaust. When the exhaust stream is lean (more oxygen), the sensor produces a low voltage signal. When the exhaust stream is rich (less oxygen), the sensor produces a high voltage signal.

The PCM continuously monitors the heated oxygen sensor (HO2S) signal for a calibrated period of time. During the monitoring period, the PCM counts the number of times that a rich to lean and lean to rich response occurs. Then, the PCM adds the amount of time it took to complete all transitions. The PCM detects a rich to lean transition when the HO2S voltage changes from more than 600 mV to less than 300 mV. The PCM detects a lean to rich transition when the HO2S voltage changes from less than 325 mV to more than 625 mV. The PCM uses the data to determine an average time for each transition. If the PCM determines that the average response time is too slow for HO2S bank 2 sensor 1, DTC P0153 will set.

Conditions for Running the DTC

•	TP sensor, MAF sensor, MAP sensor, IAT sensor, ECT sensor, EVAP system, AIR system (if equipped), fuel injector, misfire, or HO2S heater DTCs are not set.

•	DTC P1153 is not set

•	EGR Flow test inactive

•	AIR System test inactive (if equipped)

•	Catalyst test inactive

•	System voltage is between 9 and 18 volts.

•	Engine run time is more than 202 seconds (approximately 3.5 minutes).

•	Engine speed is between 1200 and 2300 RPM.

•	Coolant temperature is more than 75°C (167°F).

•	TP angle is more than 3 percent.

•	MAF is between 15 and 35 g/s.

•	Closed loop fuel control active

Conditions for Setting the DTC

•	HO2S bank 2 sensor 1 lean to rich average transition response time during the sample period was more than 100 milliseconds.

•	HO2S bank 2 sensor 1 rich to lean average transition response time during the sample period was more than 200 milliseconds.

Action Taken When the DTC Sets

•	The PCM illuminates the malfunction indicator lamp (MIL) during the second consecutive trip in which the diagnostic test runs and fails.

•	The PCM stores the conditions present when the DTC set as Freeze Frame/Failure Records data.

Conditions for Clearing the MIL/DTC

•	The PCM will turn the MIL OFF after the third consecutive trip in which the diagnostic runs and passes.

•	The history DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction.

•	The DTC can be cleared by using the scan tool Clear DTC Information function.

Diagnostic Aids

Notice: Do not solder heated oxygen sensor wires. Soldering the wires will result in the loss of the air reference to the sensor. Refer to Engine Electrical for proper wire and connection repair techniques.

For intermittent conditions, refer to Symptoms .

Test Description

The numbers below refer to the step numbers on the diagnostic table:

Verifies that the malfunction is currently present the average rich/lean and lean/rich transition times. With the ignition turned ON, the scan tool indicates the results of the last test for this diagnostic. The test conditions must be met in order for the scan tool to update the results of test for this ignition cycle.

HO2S transition time, ratio, and switching DTCs set for multiple sensors indicate probable contamination. Before replacing the sensors, isolate and correct the source of the contamination to avoid damaging the replacement sensors.

Step

Action

Values

Yes

Did you perform the Powertrain On-Board Diagnostic (OBD) System Check?

Go to Step 2

Go to Powertrain On Board Diagnostic (OBD) System Check

Important: If any DTCs are set, except P0133, P1134, or P1154, refer to those DTCs before proceeding with this diagnostic table. Refer to Diagnostic Trouble Code (DTC) List/Type to diagnose the applicable DTC.

With the engine operating at normal temperature, operate the vehicle within the Conditions for Running the DTC until the test runs for DTC P0153.
With the scan tool, monitor the Specific DTC Information for DTC P0153 until the test runs.

Does the scan tool indicate DTC P0153 failed last test?

Go to Step 3

Go to Diagnostic Aids

Does the scan tool also indicate DTC P1154 failed last test?

Go to Step 6

Go to Step 4

Visually/physically inspect for the following items:

•	Properly installed and secure HO2S bank 2 sensor 1, refer to Heated Oxygen Sensor Replacement - Bank 2 .

•	Corrosion on terminals

•	Damaged wiring

•	Proper connections at the sensor, and at the PCM, refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.

•	If a condition is found, repair as necessary. Refer to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 7

Go to Step 5

Inspect the Exhaust System for a leak.
If an exhaust leak is found, repair as necessary.

Did you find and correct the condition?

Go to Step 7

Go to Step 6

Important: Correct the source of the oxygen sensor contamination before replacing the sensor in order to prevent future contamination. Typical contamination sources include the following:

•	Fuel contamination, refer to Alcohol/Contaminants-in-Fuel Diagnosis .

•	Use of improper RTV sealant

•	Engine oil or engine coolant consumption, refer to Oil Consumption Diagnosis in Engine Mechanical.

Replace the sensor sensor. Refer to Heated Oxygen Sensor Replacement - Bank 2 .

Is the action complete?

Go to Step 7

Review and record scan tool Fail Records data.
Clear DTCs.
Operate the vehicle within the Fail Records conditions.
With a scan tool, monitor Specific DTC Information for DTC P0153 until the test runs.

Does the scan tool indicate DTC P0153 passed?

System OK

Go to Step 2