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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  • 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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P1884 code 2005suzuki forenza P0420 P0134 P0138


code p 420 refers to cat converter system , bank 1--efficiency below threshold ===causes ---cat converter faulty---wiring --heated oxygen sensor (HO2S), 2 faulty
code p 0134 refers to HO2S 1 bank 1-no activity detected ===causes --wiring open circuit -- heating inoperative --- HO2S
also refers to oxygen sensor ( O2S) 1 bank 1--no activity detected == causes wiring ---O2S
code p 0138 refers to HO2S 2 bank 1--high voltage === causes ---wiring short to positive ---HO2S--- ECM
also refers to O2S 2 bank 1 high voltage === wiring short to positive O2S -- ECM
I do not have a listing for code p 1338 but I suspect that it will refer to the other codes in some way
first fix is to check the cat converter is operational ( not cracked and blocking the exhaust system)
next replace the HO2S sensor ( one before the cat converter ) and then the O2 sensor (the one after the cat converter)
all the codes will relate to problems in that area

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1 Answer

Po136-o137 says change 02 sensor on bank 1 sensor2 I did but engine light is still on 2004 chevy tahoe


code p 0136 refers to heated oxygen sensor (HO2S) 2 bank 1 ---circuit malfunction===causes ---heating inoperative ---wiring---HO2S--- ECM
also refers to oxygen sensor (O2S0 2 bank 1---circuit malfunction===causes --- wiring---O2S ---ecm
it also refers to heated oxygen sensor (HO2S) 2 bank 1 ---no signal===causes ---wiring --- HO2S---
code p 0137 refers to HO2S 2 bank 1 ---low voltage -===causes --exhaust leak---wiring short to ground ---HO2S--- ECM
it also refers to O2S 2 bank 1---low voltage ===causes exhaust leak---wiring short to ground ---O2S ---ECM
to set you up here-- there are 4 oxygen sensors in the system
2 are heated oxygen sensors (HO2S) on in each exhaust manifold or exhaust pipe before the cat converter and
2 oxygen sensors (O2S) -- one in each exhaust pipe after the cat converters
heated oxygen sensors have 4 wires and O2S sensors normally only 2 wires
it is more that possible that you changed the wrong sensors and in the process damaged the delicate wires with the incorrect spanner being used

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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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I eplace all o2 sensor and cat ,can not get rid of engine code po420


Well you have done everything. check wiring or replace the ECM. If you took this to a shop. Find another shop.

Aug 06, 2015 | Cars & Trucks

1 Answer

How do i know if a oxygen sensor is bad verses CAM


Neither have anything to do with each other. The cam sensor is used to fire the injectors. The O2 sensors is for fuel mileage and to monitor the catalytic converter. If the O2 sensor is bad it will throw O2 codes and maybe a cat code (420). If the cat is bad, then only P0420. If the cam is bad it will set a cam code, but the ECM will go in default mode and still run the engine. Bad gas mileage, yes, But will still run. Best way to check a cat is remove the O2 sensor closest to the engine or loosen the exhaust flange. If it runs better, the cat is clogged up. Have the codes checked..

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1 Answer

P0037 code subaru outback I have replaced the cat and both o2 sensors and the same code comes up


I'm sorry you spent that money if this was the original code.

The code means one of the O2 sensors has a faulty heater or the power circuit for the heater is bad. The sensor is not heating up as fast as it should. Since you have replaced the sensor you would need to check the power circuit for the heater.

P0037 SUBARU Description Oxygen Sensors (O2S) or Heated Oxygen Sensors (HO2S) need to reach a minimum operating temperature of 750 degrees F to produce an accurate voltage signal. The faster the heated oxygen sensor reaches that temperature the faster the sensor will start sending an accurate signal to the Engine Control Module (ECM).

In order to achieve the require temperature, a heater element is included inside the heated oxygen sensor. The ECM controls the heated oxygen sensor heater element based on signals from the engine coolant temperature and engine load. The ECM controls the heater element circuit by allowing current flow to ground.

The ECM monitors the voltage signal received through the heater element circuit and determines the state of the circuit by comparing the voltage detected with the factory specifications.
Read more: http://engine-codes.com/p0037_subaru.html#ixzz26TjIZyLw

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1 Answer

New cat vs a O2 Sensor


The easiest way to see if a cat is working is to measure the exhaust temp before and after the cat. If the cat is working the after temp will be less than before. We use an inferred heat gun.
Not sure what you mean by pulsating. If your truck is a V-6 you might be able to switch the bank 2 sensor with the bank 1 to help diagnose.

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2 Answers

Ford 4.0 v6 misfiring


yes an o2 sensor can cause the mixture to go lean or rich. But you have another culprit also a knock sensor can cause this also. for the miss this is more of what the knock sensor would control. Hope this helps you

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1 Answer

1995 Ford Bronco 172 EGO not switching lean bank1- jerks when run


Have u checked for vacuum leaks or poss leaking EGR valve? use carb spray around the upper intake manifold where it bolts to the lower manifold, spray vacuum lines where they are connected to the engine vacuum ports, the idle speed will change if u hit a leak, as far as the EGR valve goes see if it gets hot at idle, if it does it is leaking, if all checks ok replace the O2 sensor, but i suspect u will find a leak at the upper intake plenum.

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1 Answer

2003 A6


No, it's either a clogged catalytic converter or, more likely, a bad secondary O2 sensor on the driver's side. The secondary sensor is the one after the catalytic converter, which is used to measure its efficiency. When that sensor fails, the computer can't judge how well the cat is working and often throws a code such as this. However, it should also throw a failed O2 sensor, sensor 2 bank 2, at the same time. You may have a bad cat, but if it comes down to replacing parts, I'd do the sensor first - it's about 15% of the price of a cat.

You could take the two secondary sensors and swap them - move the left side one to the right side and vice versa, clear the code, then scan the car again after running and see if the code comes back the same. If it does, your cat is bad. If it comes back reading a problem on bank 1, it's the sensor.

Oct 03, 2008 | 2003 Audi A6

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