Question about 1998 Ford Explorer

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Vacuum leak in a 98 ford explorer

I replaced the front o2 sensor but the engine light is still on.

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The signal flasher is located on the steering column between the steering wheel and the instrument panel and is yellow in color.-------------------------------------------------------------------------
AK90 BMW Key Programmer

Posted on Apr 20, 2013

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Posted on Jan 02, 2017

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  • 17 Answers

SOURCE: 2001 Ford Explorer Sport Throttle Position Sensor

Hi, Take a little time to check all earth mounts,There are some fine earthwires under the looms running from air intake if one of these is broken or dirty it can cause all the symptoms you describe. All the best. Phil

Posted on Sep 11, 2008

  • 59 Answers

SOURCE: 97 Ford Ranger 4.0L V6 Idles rough only when cold

Orand

Ther is a air Idle control valve located on the side of the throttle body. unplug it remove it spray it and clean it with carb cleaner replace it plug it back in and you will be a Happy person again.

Lugnut61

Posted on Feb 01, 2009

emissionwiz
  • 76846 Answers

SOURCE: all 4 o2 sensors read bad

daves944 knows what he is talking about, u need to find the root cause of this problem, which is a problem any of th following can cause this, MAF, Intake leaks, engine conditions like low compression and many other things, the O2 codes are a Symptom not the problem, you may also have a wiring harness problem, check the harness connectors to the O2 sensors, look for exhaust heat related wiring damage, look for corrosion in connectors.

Posted on May 01, 2009

MNfisherman
  • 11896 Answers

SOURCE: 2003 Ford Taurus stalls at idle

go to autozone.com and register for free. You will then have a full free online repair manual with step-by-step directions, diagrams, troubleshooting, testing, replacing, and more. As an automechanic myself, this a wonderful site.

Posted on Jul 09, 2009

  • 4 Answers

SOURCE: 2000 ford escort ZX2 with P0171 trouble code.

I am working on the same problem. This 2000 ZX2 was idling rough and throwing a p171 code (bank 1 too lean). I hooked up a scanner to the OBDII port and you could see the O2 sensor at 0 or very low voltage and not switching and the fuel compensation maxed out which indicates a lean condition. Using a flammable Carb cleaner and the engine running I sprayed around the vacuum hoses until the idle picked up. I found a rubber elbow that connects to the bottom of the intake maniflold and feeds vacuum to the PCV valve. Replacing the the elbow with a suitable replacment from the auto part misc parts cards display had it running smoothly and the O2 sensor switching properly. Since this was happening at idle it was not the fuel filter which can cause a lean condition in upper rpms. It is not the MAF or the O2 sensor since it switches when not at idle. Also check the smaller vacuum lines that go to the evap control from the intake vacuum ports (back of manifold just below the throttlebody, most will be cracking if your car is anything like mine. I have also seen this problem with a bad PCV valve.

Posted on Jun 14, 2010

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2 Answers

The check engine light is on. Autozone said that the fuel mixture is too lean.


I'm surprised they didnt sel you a oxygen sensor. Let the engine idle and see if you can locate a vacuum leak. listen for a air hissing noise. the pcv lines have rubber ends and are suspect. the dealer will have the parts you need.

Dec 11, 2010 | 2005 Ford Explorer Sport Trac

1 Answer

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


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

May 28, 2010 | 1998 Ford Escort

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98 ford explorer oil pressure sensor location


2.9L and 4.0L engines-Left side front of the engine, below the cylinder head in the engine block

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Nov 28, 2009 | 1998 Ford Explorer

1 Answer

97 ford explorer battery alternator and battery just replaced. Engine light is on and 4w drive lo and high lights keep blinking, what's wrong?


might have a bad o2 sensor wich is tripping your check engine light and a vacuum leak wich is causing your 4lo 4 high light to blink

Nov 02, 2009 | 1997 Ford Explorer AWD

1 Answer

2002 ford expedition "service engine soon" light keeps coming on. I've had the O2 sensor replaced three times in the past month, now the next day or two after the sensor replacement the light comes back...


get a new mechanic, need to check for vac. leaks, poss needs tune up. alot O2 codes i have gotten have been created by vacuum leak or warn out plugs, rarely have i had to replace a O2 sensor.

Oct 14, 2009 | 2002 Ford Expedition

1 Answer

Oxygen sensor(s)


Most times the O2 is not the problem but just the symptom of another problem, most times a vacuum leak, let me have the codes the engine u have an the miles on the car and i will let u know whether the O2 sensors are defective, there are 2 O2's, they are just before the catalytic converter, the sensors after the cats is the catalyst efficiency monitors, 2 of them.

May 21, 2009 | 1996 Ford Explorer

1 Answer

O reading for O2 sensors on 98 Ranger XLT


Yes the 98 ranger has 3 02 sensors,they are located in the exhaust system under vehicle,2 of them
are in front of the cataletic converter and 1 behind it.I replaced mine ,reset the codes and the check
engine light still comes on?

Jan 16, 2009 | 2004 Ford Ranger

1 Answer

What is a p1131 code and how do i fix it


P1131, Lack of Upstream Heated Oxygen Sensor Switch - Sensor Indicates Lean - Bank No. 1 ...

MOST LIKELY THE UPSTREAM (BEFORE THE CATALYTIC CONVERTOR) O2 SENSOR IN BANK ONE IS DEFECTIVE, ALSO CHECK FOR ANY ENGINE VACUUM LEAKS, A CAN OF CARB SPRAY HELPS TO SHOW IF ANY LEAKS ARE PRESENT, THE IDLE RPM WILL INCREASE WHEN THE CARB SPRAY HITS A LEAK, IF NO LEAKS FOUND REPLACE THE BANK ONE O2 SENSOR.

Dec 08, 2008 | 1996 Ford Explorer

5 Answers

Code #P0171 & code #P0174


Look, man here is the deal:
code p0174 - refer to the front cylinder bank
code p0171 - refer to the rear cylinder bank

Jun 22, 2008 | 2002 Ford Explorer Sport

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