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Code P1151

Tiny
DKLANK1964
  • MEMBER
  • 2002 FORD TAURUS
  • 3.0L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 157,000 MILES
I'm getting a P1151 code, which is for Bank 2 sensor 1 O2 sensor. Although I am not getting any additional codes, my scanner is telling me that I have failure in:

# 26 Initial tank vacuum and maximum limit in H20
# 2A Phase 4 Vapor generation maximum change in pressure and max threshold in H20
# 2B Phase 4 Vapor generation maximum absolute pressure rise and max threshold in H20

I'm concerned THIS is why I'm getting the P1151 code, but I don't know how to correct these other failures. I have already replaced all 6 injectors to get rid of cylinder misfire codes, as well as plugs, plug wires, coil pack and PCV. I have cleaned MAF sensor and throttle body, but I'm getting the same rough idle/running like I did with the initial misfires.

Thanks for the help.
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Monday, August 3rd, 2020 AT 12:51 PM

14 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good afternoon,

What misfire codes? You said nothing of them. Can you give me all the codes that were set?

https://www.2carpros.com/articles/engine-misfires-or-runs-rough

The 1151 has many possibilities. I posted them below.

https://www.2carpros.com/articles/how-an-oxygen-sensor-works

https://www.2carpros.com/articles/how-to-test-an-oxygen-sensor-02-sensor

Did you check the fuel pressure? Low fuel pressure will cause the misfire codes.

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

Roy

DTC
P1151
Symptom Descriptor
Lack Of Ho2S-21 Switch, Sensor Indicates Lean
Probable Causes
Air Induction System Leak after the Mass Air Flow (MAF) Sensor
Air Leaks After the Mass Airflow (MAF)
Camshaft Timing
Camshaft Timing Incorrect
Cylinder Compression
Cylinder Compression Incorrect
Diaphragm or EGR Vacuum Regulator (EVR) Leaking
Engine Oil Dipstick
Engine Oil Dipstick Incorrectly Seated
Excessive Fuel Pressure
Exhaust Gas Recirculation (EGR) Valve
Exhaust Gas Recirculation (EGR) Valve Malfunction
Exhaust Gas Recirculation Valve Solenoid (EVR)
Exhaust Leak
Exhaust Leak Before or Near the Heated Oxygen Sensor (HO2S)
Fuel Injectors
Fuel Injectors Leaking and or Contaminated
Fuel Pressure Excessive
Fuel Pressure Low or Insufficient Fuel
Fuel Pressure Regulator
Fuel Pressure Regulator Leaking
Gasket Leaking
Harness or Heated Oxygen Sensor (HO2S) Short to Ignition Switched Power (VPWR)
Heated Oxygen (HO2S) Sensor
Heated Oxygen Sensor (HO2S)
Heated Oxygen Sensor (HO2S) Circuit Open or Shorted
Low Fuel Pressure or Running Out of Fuel
Oil Overfull
Overfilled Oil
Poor Mating Terminals and Wiring or Corrosion
Positive Crankcase Ventilation (PCV) System
Powertrain Control Module (PCM)
Powertrain Control Module (PCM) Damaged
Vacuum Leak
Vacuum Leaks
Vapor Recovery System
Water in Harness Connector
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Monday, August 3rd, 2020 AT 1:09 PM
Tiny
DKLANK1964
  • MEMBER
  • 9 POSTS
Fuel pressure was 285 at 3,000 rpm's. The original misfire code was P302. After replacing the fuel injector it resolved. 3000 miles later I got P304, P305 and P306 and Bank 2 Sensor 2. I replaced those 3 injectors and the O2 sensor, as well as plugs, plug wires and coil pack. Still have the rough idle like I did with misfire codes present. I now have no other code but the P1151, which isn't supposed to create driveability issues, but they're there.
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Monday, August 3rd, 2020 AT 1:31 PM
Tiny
DKLANK1964
  • MEMBER
  • 9 POSTS
I should clarify, 285 KPa according to the scan tool.
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Monday, August 3rd, 2020 AT 1:33 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
The 1151 is not causing the issues.

The rough idle could be mechanical. I would start by checking the compression.

https://www.2carpros.com/articles/how-to-test-engine-compression

The spec is 30-50 key on, engine off.

Roy
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Monday, August 3rd, 2020 AT 1:37 PM
Tiny
DKLANK1964
  • MEMBER
  • 9 POSTS
I'll check that tomorrow and let you know what I find. Thanks very much for some direction.
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Monday, August 3rd, 2020 AT 1:40 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
You are welcome.

Always glad to help.

Roy
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Monday, August 3rd, 2020 AT 1:43 PM
Tiny
DKLANK1964
  • MEMBER
  • 9 POSTS
Okay, so compression check complete:

Cylinder 1 200
Cylinder 2 190
Cylinder 3 190
Cylinder 4 160/240 (w/oil)
Cylinder 5 90/150 (w oil)
Cylinder 6 190
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Tuesday, August 4th, 2020 AT 9:43 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Okay, you have an issue with number 5. 90 is way too low and you have unburned fuel exiting the cylinder and that will set the code.

From the readings, you have a ring issue with the change with oil.

https://www.2carpros.com/articles/replace-engine-piston-rings

Looks like that is the issue.

Roy

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Tuesday, August 4th, 2020 AT 9:49 AM
Tiny
DKLANK1964
  • MEMBER
  • 9 POSTS
Yeah, I don't think the car is worth the time/money to repair. Pistons rings etc, are outside my ability. I assume if we keep driving the car it will eventually result in catastrophic failure.
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Tuesday, August 4th, 2020 AT 9:59 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Correct. It will eventually fail on you altogether.

Roy
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Tuesday, August 4th, 2020 AT 10:02 AM
Tiny
DKLANK1964
  • MEMBER
  • 9 POSTS
Thanks so much for your help!
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Tuesday, August 4th, 2020 AT 10:04 AM
Tiny
DKLANK1964
  • MEMBER
  • 9 POSTS
One more thing, is there any value in using a thicker oil viscosity?
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Tuesday, August 4th, 2020 AT 10:08 AM
Tiny
ASEMASTER6371
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Not really. It would help with worn main and rod bearings but not with compression.

Roy
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Tuesday, August 4th, 2020 AT 10:13 AM

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