Aston Martin diagnostic trouble code
P2195: O2 Sensor Signal Stuck Lean - Bank 1, Sensor 1
Use this reference to understand the recorded condition, confirm the available V8 Vantage or DB9 manual coverage, and follow the documented diagnostic checks before replacing parts.
- Code family
- Powertrain
- Vehicle system
- Oxygen sensors
- Manual coverage
- V8 Vantage, DB9
- Warning-lamp status
- V8 Vantage: MIL; DB9: MIL
What Aston Martin code P2195 means
O2 Sensor Signal Stuck Lean - Bank 1, Sensor 1
DB9 preliminary diagnostic manual · section 2-308
Manufacturer fault-analysis procedure
Manual fault definition
P2195 O2 sensor 1-1 Signal stuck lean.
P2196 O2 sensor 1-1 Signal stuck rich.
P2197 O2 sensor 2-1 Signal stuck lean.
P2198 O2 sensor 2-1 Signal stuck rich.
P2270 O2 sensor 1-2 Signal stuck lean.
P2271 O2 sensor 1-2 Signal stuck rich.
P2272 O2 sensor 2-2 Signal stuck lean.
P2273 O2 sensor 2-2 Signal stuck rich.
P2196 O2 sensor 1-1 Signal stuck rich.
P2197 O2 sensor 2-1 Signal stuck lean.
P2198 O2 sensor 2-1 Signal stuck rich.
P2270 O2 sensor 1-2 Signal stuck lean.
P2271 O2 sensor 1-2 Signal stuck rich.
P2272 O2 sensor 2-2 Signal stuck lean.
P2273 O2 sensor 2-2 Signal stuck rich.
Test sequence and decision path
1. Connect the WDS and record all logged DTCs.
Note which code is logged. Also note which PCM
has recorded the fault.
2. Check the exhaust system for leaks.
Check the HO2S wiring for crossed connections,
damaged pins or damaged harness.
Remove each oxygen sensor and check for contamination or damage. Service any defects identified.
Run the KOER Test and check for any of the above
DTCs.
If any of the above DTCs are present, go to step 3.
If the DTCs listed above are not present, the fault
is not present at this time and testing is complete.
3. Ignition off. Check the HO2S harness circuits for
shorts to power or to ground:
Disconnect the PCM
Disconnect all suspect oxygen connectors.
Check for short circuits in each sensor wiring by
measuring resistance to ground and to
+5 and +12 volt supplies.
If each resistance is above 10kΩ, go to step 4.
If any resistance is below 10k Ω, repair the short
circuit. Clear the DTCs and run a KOER test to
ensure that the problem is resolved.
4. Check the continuity of the HO2S circuits:
Measure the continuity from the PCM connector
to the oxygen sensor connector for the signal and
signal return line of the suspect sensor.
If continuity is less than 5Ω, go to step 5.
If the continuity is more than 5Ω, repair the open
circuit and rerun the Quick Test (see Special Tests
in the introduction to this manual) to ensure that
the problem is resolved.
5. Check for overvoltage on the HO2S circuit:
PCM connected, Suspect oxygen sensor disconnected. Key on.
Measure the voltage from signal return to battery
negative at the HO2S connector.
Measure the voltage between the HO2S signal
and battery negative.
If any reading is above 1.5 volts, go to step 6.
If any voltage readings is below 1.5 volts, replace
the affected sensor, reconnect all components.
Clear the fault code and run a KOER test to
ensure that the problem is resolved.
6. Check continuity of the HO2S ground circuit:
Key off. PCM disconnected. Measure the resistance between SIG RTN (Primary PCM pin
C0634-41 or Secondary PCM pin C0636-41) and
PWR GND (Primary PCM connector C0635 pins
10, 47, 48 and 49 or secondary PCM connector
C0638 pins 10, 47, 48 and 49).
If the resistance is less than 5.0Ω, go to step 7.
If the resistance is more than 5.0 Ω, replace the
PCM. Reconnect all components and run the
KOER Test to ensure that the problem is resolved.
7. Apply 12 volts to the suspect HO2S circuit:
Key off. Disconnect the suspect HO2S connector.
Install a jumper lead from the HO2S signal terminal to the VPWR terminal at the HO2S connector.
Key on. Monitor the HO2S signal using the WDS.
If the signal voltage is above 1.5 volts, replace the
defective HO2S sensor. Reconnect all components. Complete a HO2S monitor drive cycle.
Run the KOER Test to ensure that the problem is
resolved.
8. If the signal voltage is less than 1.5 volts, consult
Aston Martin Technical Support.
Open the corresponding manual page for wiring diagrams and figures
Note which code is logged. Also note which PCM
has recorded the fault.
2. Check the exhaust system for leaks.
Check the HO2S wiring for crossed connections,
damaged pins or damaged harness.
Remove each oxygen sensor and check for contamination or damage. Service any defects identified.
Run the KOER Test and check for any of the above
DTCs.
If any of the above DTCs are present, go to step 3.
If the DTCs listed above are not present, the fault
is not present at this time and testing is complete.
3. Ignition off. Check the HO2S harness circuits for
shorts to power or to ground:
Disconnect the PCM
Disconnect all suspect oxygen connectors.
Check for short circuits in each sensor wiring by
measuring resistance to ground and to
+5 and +12 volt supplies.
If each resistance is above 10kΩ, go to step 4.
If any resistance is below 10k Ω, repair the short
circuit. Clear the DTCs and run a KOER test to
ensure that the problem is resolved.
4. Check the continuity of the HO2S circuits:
Measure the continuity from the PCM connector
to the oxygen sensor connector for the signal and
signal return line of the suspect sensor.
If continuity is less than 5Ω, go to step 5.
If the continuity is more than 5Ω, repair the open
circuit and rerun the Quick Test (see Special Tests
in the introduction to this manual) to ensure that
the problem is resolved.
5. Check for overvoltage on the HO2S circuit:
PCM connected, Suspect oxygen sensor disconnected. Key on.
Measure the voltage from signal return to battery
negative at the HO2S connector.
Measure the voltage between the HO2S signal
and battery negative.
If any reading is above 1.5 volts, go to step 6.
If any voltage readings is below 1.5 volts, replace
the affected sensor, reconnect all components.
Clear the fault code and run a KOER test to
ensure that the problem is resolved.
6. Check continuity of the HO2S ground circuit:
Key off. PCM disconnected. Measure the resistance between SIG RTN (Primary PCM pin
C0634-41 or Secondary PCM pin C0636-41) and
PWR GND (Primary PCM connector C0635 pins
10, 47, 48 and 49 or secondary PCM connector
C0638 pins 10, 47, 48 and 49).
If the resistance is less than 5.0Ω, go to step 7.
If the resistance is more than 5.0 Ω, replace the
PCM. Reconnect all components and run the
KOER Test to ensure that the problem is resolved.
7. Apply 12 volts to the suspect HO2S circuit:
Key off. Disconnect the suspect HO2S connector.
Install a jumper lead from the HO2S signal terminal to the VPWR terminal at the HO2S connector.
Key on. Monitor the HO2S signal using the WDS.
If the signal voltage is above 1.5 volts, replace the
defective HO2S sensor. Reconnect all components. Complete a HO2S monitor drive cycle.
Run the KOER Test to ensure that the problem is
resolved.
8. If the signal voltage is less than 1.5 volts, consult
Aston Martin Technical Support.
Supporting owner context
What owners have reported
These oxygen-sensor mixture and status codes are best assessed as a group, with exhaust leaks, wiring and related DTCs considered before condemning multiple sensors.
This is supporting owner-reported context, not a replacement for the manufacturer procedure or a diagnosis of every vehicle.
Read the related owner discussion