Code P1131 (pd)

180

Asked by Jan 06, 2016 at 04:40 PM about the 2002 Mercury Sable LS

Question type: Maintenance & Repair

Car just sputtering code P 1131 (pd)

2 Answers

73,775

Possible causes p1131:>--- - Faulty Upstream Oxygen Sensor Bank 1 - Fuel pressure high or low - MAF sensor dirty/defective - Vacuum leak on engine - Leaking fuel injector or fuel pressure regulator - Faulty Powertrain Control Module (PCM) What does this mean? What does this mean? Tech notes Though the Oxygen (O2) sensor, the Engine Control Module (ECM) has detected a lean system, which means that there is either not enough fuel or and excessive amount of air in the system. Start by checking for vacuum leaks. When is the code detected? When an HO2S sensor indicates lean at the end of a test, the system is trying to correct for an over-lean condition. The code is set when the fuel control system no longer detects switching for a calibrated amount of time. Possible symptoms - Engine Light ON (or Service Engine Soon Warning Light) P1131 Mercury Description The Heated Oxygen Sensor (HO2S) Monitor is an on-board strategy designed to monitor the HO2S sensors for a malfunction or deterioration that can affect emissions. Under specific conditions, the fuel control or upstream HO2S sensors are checked for proper output voltage and response rate (the time it takes to switch from lean to rich or rich to lean). Downstream HO2S sensors used for Catalyst Monitor are also monitored for proper output voltage. Input is required from the Engine Coolant Temperature (ECT) or Cylinder Head Temperature (CHT), Inlet Air Temperature (IAT), Mass Air Flow (MAF), Throttle Position (TP) and Crankshaft Position (CKP) sensors to activate the HO2S Monitor. The Fuel System Monitor and Misfire Detection Monitor must also have completed successfully before the HO2S Monitor is enabled. • The HO2S sensor senses the oxygen content in the exhaust flow and outputs a voltage between zero and 1.0 volt. Lean of stoichiometric (air/fuel ratio of approximately 14.7:1 for gasoline engines), the HO2S will generate a voltage between zero and 0.45 volt. Rich of stoichiometric, the HO2S will generate a voltage between 0.45 and 1.0 volt. • The HO2S Monitor evaluates both the upstream (Fuel Control) and downstream (Catalyst Monitor) HO2S for proper function. • Once the HO2S Monitor is enabled, the upstream HO2S signal voltage amplitude and response frequency are checked. Excessive voltage is determined by comparing the HO2S signal voltage to a maximum calibratable threshold voltage. • A fixed frequency closed loop fuel control routine is executed and the upstream HO2S voltage amplitude and output response frequency are observed. A sample of the upstream HO2S signal is evaluated to determine if the sensor is capable of switching or has a slow response rate. • An HO2S heater circuit fault is determined by turning the heater on and off and looking for a corresponding change in the OSM and by measuring the current going through the heater circuit. • The MIL is activated after a fault is detected on two consecutive OBD II drive cycles.

3 of 3 people found this helpful.
Best Answer Mark helpful
180

Thank you very much, need to ask rear 02 sensor able to do without taking off manifold. Looks like can do this from bottom or top.

Your Answer

Mercury Sable Experts

  • #1
    JP1956
    Reputation
    690
  • #2
    Tom Demyan
    Reputation
    620
  • #3
    Guy Outland
    Reputation
    400
View All

Related Models For Sale

Used Ford Taurus
252 Great Deals out of 16,479 listings starting at $1,850
Used Mercury Grand Marquis
32 Great Deals out of 1,762 listings starting at $1,950
Used Toyota Camry
1,042 Great Deals out of 72,499 listings starting at $295
Used Honda Accord
1,112 Great Deals out of 61,914 listings starting at $999
Used Ford Escape
1,055 Great Deals out of 87,254 listings starting at $1,088
Used Chevrolet Malibu
1,127 Great Deals out of 71,719 listings starting at $1,995
Used Ford Mustang
731 Great Deals out of 38,316 listings starting at $895
Used Lincoln Town Car
31 Great Deals out of 1,753 listings starting at $1,500
Used Nissan Altima
1,024 Great Deals out of 75,527 listings starting at $1,627

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.