Question about 1998 Ford Escort

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I got error code for bad o2 sensor. and MAF sensor

I got error code for bad o2 sensor. replaced front sensor kept idling low and stalling out.then I got another error code of bad o2 sensor and bad mass air flow sensor..replaced both still real jerky and stalling out...HELP PLEASE

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You're looking at this the wrong way, i suspect you have an engine problem, do a compression and leak down test, also look for a vacuum leak after the maf sensor

Posted on May 28, 2010

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2000. What causes the engine to want to stall at low idle?


Could be many things-- dirty IAC, bad MAF, bad tune up items, O2 sensor, clogged exhaust, bad TPS.

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When car is in park or stopped the rpms fluctuate below 1 and car stalls out.


Idle speed is normally controlled by the idle air control motor. These units get dirty and fail, but can often be cleaned and restored to normal function. You will need to remove the unit to clean it, but be careful not to damage the plunger and seat. Use carb + choke cleaner and maybe a small screwdriver (carefully), then blow unit out with compressed air. Replace gaskets as needed. Also low idle can be caused by vacuum leaks, bad O2 sensor, clogged exhaust (cat converter), dirty MAF, bad coolant temp sensor.

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1999 passat check engine light on and low idle


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Mar 28, 2014 | 2005 Ford Five Hundred

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I just got my car scanned and a few codes pop up


Error Code: P0130
Fault:
Oxygen Sensor (O2S) 1, Bank 1 - Circuit Malfunction
Possible Cause:
Malfunction Indicator Lamp (MIL) Triggered on first occurrence.
-Wiring harness.
-Oxygen sensor (O2S).
-Engine control module (ECM).

Error Code: P0505
Fault:
Idle Speed Control (ISC) System - Malfunction
Possible Cause:
-Wiring harness.
-Idle speed control (ISC) actuator/Idle air control valve (IAC) valve.
-Throttle motor.
-Throttle valve tight/sticking.
-Engine control module (ECM).

Error Code: P0100
Fault Location:
-Mass Air Flow (MAF) Sensor/Volume Air Flow (VAF) Sensor - Circuit --Malfunction
Possible Cause:
-Wiring harness.
-Mass air flow (MAF) sensor.
-Volume air flow (VAF) sensor.
-Engine control module (ECM).

Error Code: P1491
Fault:
Exhaust Gas Recirculation (EGR) Valve Insufficient Lift
Possible Cause:
-Wiring harness.
-EGR Valve.
-ECM

Error Code:P1607
Fault:
-Engine Control Module (ECM)/Powertrain Control Module (PCM)

Error Code: P0966
Location:
-Pressure Control (PC) Solenoid B - Circuit Low
Possible Cause:
-Wiring short to earth.
-Pressure control (PC) solenoid.
-Engine control module (ECM)/Powertrain control module -(PCM)/Transmission control module (TCM) .


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1 Answer

Ford Taurus Engine Light is: P0171 & P0174. I am thinking a MAF Sensor


Could be a problem with the MAF sensor but if it is you should have a code for that too.
Other causes include low fuel pressure, and a vac leak or air leak in the intake hose to the MAF.
The codes mean the ECM can not make the injectors rich enough to make the O2 sensors switch back and forth.

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Want to know what a code PO171 means(system too lean bank1).car idles rough and blows black smoke when you rev it up.and is also misfiring.?


If the car is thinking its lean, but its blowing black smoke then it sounds like its confused. Sounds like the o2 sensor is bad. How does it run when its cold?

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Engine stalls when restarted idles up and down and stalls


I went through this scenario while working in a toyota sienna a few months ago and it ended up being the battery. When battery supply voltage starts to drop the PCM will limit voltage to certain areas.

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