Question about 1993 Ford Taurus

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CODE 172 ego not switching lean condition

The car has a new cat. o2 sensor, pfe and ECM coding 172 EGO not switching. I am running out of part6s to throw at this car. I am truly stumped.

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  • Brian032472
    Brian032472 Jan 30, 2009

    It seems to run absolutely fine for up to 10 miles without a check engine or any abnormal running conditions. After a start cycle or two it will set the MIL and regardless of the amount of throttle you apply it bogs down miserebly and won't get out of it's own way after you shut it down for two to five minutes it resets the MIL and runs like a champ until it's next fall flat on it's face incident.

  • Brian032472
    Brian032472 Jan 30, 2009

    it has a new fuel pump and fuel filter no issue with fuel pressure either. what does EGO not switching imply?

  • Brian032472
    Brian032472 Feb 01, 2009

    Thanks for your help after the new PCM all cleared finally.

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  • Master
  • 659 Answers

It is possible you have a leaking injector on that bank. how does the vehicle run?

Posted on Jan 29, 2009

  • warlock61
    warlock61 Jan 30, 2009

    have you checked fuel pressure? When was the fuel filter changed last?

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1 Answer

How to fool the ecm by altering the o2 sensor.


What code is it giving ? p0172 system too rich bank 1 ? If it is staying around 0.8 millivolts try introducing a vacuum leak an see if it goes lean ! If it does it is working fine . You probably have leaking fuel injectors or a fault fuel pressure regulator ! You need a better scan tool to check fuel trims , short term am long term ,to see if the computer is adding or subtracting fuel ! Oxygen Sensor Test fixed rich signal Ford O2 Sensor Testing

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What does code p1131 mean on a 2001 ford taurus


P1131 Ford
P1131 Ford - Lack of Upstream Heated Oxygen Sensor Switch Sensor Indicates Lean Bank 1

Repair Importance Level: 3/3

Repair Difficulty Level: 2/3

http://engine-codes.com/p1131_ford.html

Forum Code

Possible causes

- Faulty Oxygen Sensor

- Vacuum leak affecting bank 1 only

- Fuel injector problem bank 1

- Check for cylinder misfire on bank 1

- Engine mechanical condition

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?

The Engine Control Module (ECM) detected bank 1 oxygen (O2) at its lean limit

Possible symptoms

- Engine Light ON (or Service Engine Soon Warning Light)

P1131 Ford Description

A Heated Exhaust Oxygen (HO2S) sensor indicating rich at the end of a test is trying to correct for an over-lean condition. The test fails when the fuel control system no longer detects switching for a calibrated amount of time.

Read more: http://engine-codes.com/p1131_ford.html#ixzz3izk89wMu

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I need to know the code dtc44 for a 1990 Buick Century


GM OBD Trouble Code 44

Auto Systems and Repair

Oxygen Sensor Error (Lean Condition Indicated) The ECM receives a signal from the O2 sensor based on the amount of oxygen in the exhaust. If there is excess oxygen in the exhaust, it is in lean condition and the O2 sensor voltage will be low. The ECM uses this information to adjust the amount of fuel delivered to each cylinder.
Fault Code Description
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  • On V-type engines with two O2 sensors, code 44 would indicate the left bank sensor is lean
Symptoms
  • Lack of power
Common Problems
  • Faulty O2 sensor
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1 Answer

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What type of vehicle?
The P0171 is a lean condition and the P0172 is a rich condition, so you have two opposing codes being thrown.

Check for an intake leak to rectify the lean code. But you may have a couple of faulty O2 sensors. Click this link to see what the codes are for your particular vehicle.

http://engine-codes.com/

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1 Answer

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Exhaust Gas Oxygen or otherwise known as the O2 sensor ford used this term up until 1994 when the federal regulations mandated industry standard terms and the implementation of the enhanced computer diagnostic system known as OBDII your O2 sensor is staying above .5v more than it should could be running rich,fouled plugs, plug wires excess fuel or a bad o2 sensor

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Replace the one or two O2 Sensors, that are the closest to the motor,
if they have 80,000 miles or more on them

If you have no idea how old the rear ones are,do them as well

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1 Answer

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