Question about 2000 Ford Excursion

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P0171 car shakes while driving around 2500 rpm

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p0171 - selectachapter.gif







Ford Excursion, Expedition, Lincoln Navigator 2000-2005



4.6L V8 VIN 6 Auto 1



Print

4.6L V8 VIN 6 Auto



Trouble Code: P0018

Crankshaft Position - Camshaft Position Correlation - Bank 2 Sensor A

Possible Causes:

Camshaft timing incorrectly set

VCT solenoid stuck in position

Camshaft advance mechanism binding (VCT unit)




Trouble Code: P0102

MAF Sensor Circuit Low Input

Possible Causes:

Check for leaks at air outlet tube

Sensor power circuit open, sensor ground circuit open

Sensor signal circuit open (may be disconnected)

Check for loose tube clamps near the MAF sensor




Trouble Code: P0103

MAF Sensor Circuit High Input

Possible Causes:




Check for a restricted inlet screen on the MAF sensor.

MAF sensor signal circuit is shorted to system power (B+)

MAF sensor is damaged or the PCM has failed




Trouble Code: P0112

Intake Air Temperature Sensor Circuit Low Input

Possible Causes:

IAT sensor signal circuit is grounded (check wiring & connector)

IAT sensor is damaged or it has failed

PCM has failed




Trouble Code: P0113

Intake Air Temperature Sensor Circuit High Input

Possible Causes:

IAT sensor signal circuit is open (inspect wiring & connector)

IAT sensor signal circuit is shorted to VREF (5v)

IAT sensor is damaged or it has failed

PCM has failed



Trouble Code: P0117
ECT Sensor Circuit Low Input

Possible Causes:

ECT sensor signal circuit is grounded in the wiring harness

ECT sensor is damaged or the PCM has failed


Trouble Code: P0118

ECT Sensor Circuit High Input

Possible Causes:

ECT sensor signal circuit is open (inspect wiring & connector)

ECT sensor signal circuit is shorted to VREF (5v)

ECT sensor is damaged or it has failed

PCM has failed




Trouble Code: P0121


TP Sensor Signal Range/Performance

Possible Causes:

Throttle plate is binding, dirty or sticking

TP sensor signal circuit open (inspect wiring & connector)

TP sensor ground circuit open (inspect wiring & connector)

TP Sensor is damaged or has failed

Trouble Code: P0122

TP Sensor Circuit Low Input

Possible Causes:

TP sensor signal circuit open (inspect wiring & connector)

TP sensor signal shorted to ground (inspect wiring & connector)

TP sensor VREF circuit is open (between the sensor and PCM)

TP sensor is damaged or has failed

PCM has failed




Trouble Code: P0123

TP Sensor Circuit High Input

Possible Causes:

TP sensor not seated correctly in housing (may be damaged)

TP sensor signal is circuit shorted to VREF or system voltage

TP sensor ground circuit is open (check the wiring harness)

Perform a "sensor sweep test" and monitor for any glitches

PCM has failed




Trouble Code: P0125

Insufficient Coolant Temperature For Closed Loop

Possible Causes:

Check the coolant mixture for an incorrect mixture

Check the operation of the thermostat (it may be stuck open)

ECT sensor (or the CHT sensor) has failed

Inspect for low coolant level




Trouble Code: P0126

Insufficient Coolant Temperature For Closed Loop

Possible Causes:

Check the coolant mixture for an incorrect mixture

Check the operation of the thermostat (it may be stuck open)

ECT sensor (or the CHT sensor) has failed

Inspect for low coolant level



Trouble Code: P0131

HO2S-11 (Bank 1 Sensor 1) Circuit High Input

Possible Causes:

HO2S connector pins damaged

Loose circuit connections (including harness connectors)

PCM has failed


Trouble Code: P0132

HO2S-11 (Bank 1 Sensor 1) Circuit High Input

Possible Causes:
HO2S signal shorted to heater power circuit inside connector

HO2S signal circuit shorted to VREF or to system voltage

PCM has failed


Trouble Code: P0133

HO2S-11 Circuit Slow Response (Bank 1, Sensor 1)

Possible Causes:

Contaminated HO2S* Exhaust leaks

Shorted/open wiring

Incorrect fueling

MAF sensor

Deteriorating HO2S

Inlet air leaks




Trouble Code: P0135

HO2S-11 Heater Circuit (Bank 1, Sensor 1)

Possible Causes:

Vacuum hose disconnected on exhaust gas recirculation (EGR) system module (ESM) applications

Short to VPWR in the harness or HO2S

Water in the harness connector

Open VPWR circuit

Open GND circuit

Low battery voltage

Corrosion or incorrect harness connections

Damaged HO2S heater

Trouble Code: P0136

HO2S-12 Circuit Malfunction (Bank 1, Sensor 2)

Possible Causes:
Pinched, shorted, and corroded wiring and pins

Crossed sensor wires

Exhaust leaks

Contaminated or damaged sensor
Trouble Code: P0138

HO2S-11 (Bank 1 Sensor 1) Circuit High Input

Possible Causes:

HO2S signal shorted to heater power circuit inside connector

HO2S signal circuit shorted to VREF or to system voltage

PCM has failed




Trouble Code: P0141

HO2S-11 Heater Circuit (Bank 1, Sensor 1)

Possible Causes:
Vacuum hose disconnected on exhaust gas recirculation (EGR) system module (ESM) applications* Short to VPWR in the harness or HO2S

Water in the harness connector

Open VPWR circuit

Open GND circuit

Low battery voltage

Corrosion or incorrect harness connections

Damaged HO2S heater




Trouble Code: P0152

HO2S-21 (Bank 2 Sensor 1) Circuit High Input

Possible Causes:

* HO2S is contaminated (due to presence of silicone in fuel)

HO2S signal tracking (due to oil or moisture in the connector)

HO2S signal circuit is open or shorted to VREF

PCM has failed




Trouble Code: P0153

HO2S-21 (Bank 2 Sensor 1) Circuit Slow Response

Possible Causes:

HO2S is contaminated (due to presence of silicone in fuel)




Trouble Code: P0171

Fuel System Too Lean (Cylinder Bank 1)

Possible Causes:

Air leaks after the MAF sensor, or leaks in the PCV system

Exhaust leaks before or near where the HO2S is mounted

Fuel injector(s) restricted or not supplying enough fuel

Fuel pump not supplying enough fuel during high fuel demand conditions

Leaking EGR gasket, or leaking EGR valve diaphragm

MAF sensor dirty (causes PCM to underestimate airflow)

Vehicle running out of fuel or engine oil dip stick not seated

Posted on Apr 24, 2013

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I just wanted to know the optimal shifting points to do 70mph comfortably. Should the car be at 2500-3000 rpm in 5th gear at 60-65 mph? I typically shift at or around 3k rpm in every gear, and the car...


How many gears does your car have? One of my cars has to do a little over 3000rpm to maintain 70-75 in 5th gear. My other car has to do about 3000rpm to maintain 65-70 in 5th gear.

It all depends on the number of gears your car has and the gearing ratio. The second car I have is geared more optimally for city driving and gets better fuel economy going slower than fast highway speeds.

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Hi, I have a 2006 Altima with 31,500 miles. Recently, the engine start shaking when car is Idle but I still feel the shake when driving or at red lights. My second problem is a weird loud (humming) noise...


You don't need to change the spark plugs since it has only 31.5 K. The plugs should last 60K. There is a an adjustment at the gas cable end at engine to increase the idle a little bit. You can increase rpm at idle to 600 RPM. Since your RPM at idle is low that why it is shaking at idle, red lights. Let me know it it is shaking at high speed ( 2500 RPM)

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No....the rpms differ from engine to engine and from manufacturer to manufacturer. RPM's are always higher at higher speeds.

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