Question about 1995 Ford Taurus

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Runs rich fresh ford engine but failed emissions test,excessive hydro carbons & getting worse as it runs. could the O2 sensors be fouled to the point that the computer isn't getting proper data?

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  • Contributor
  • 55 Answers

Sounds like it might be a MAF sensor, check for codes.

Posted on Aug 26, 2014

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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chuck943
  • 783 Answers

SOURCE: I have a 96 Ford Explorer. The service engine

P0141 is for an open or short in the heater circuit of bank 1(passenger side) rear O2 sensor(the one after the catayltic converter). This code will set when the computer runs the heated oxygen sensor monitor which is basically a program kinda like an anitvirus scan on your home PC.
During testing, the HO2S heaters are checked for opens/shorts and excessive current draw. The code will set when current draw exceeds a maximum calibrated limit(3amps) or falls below a minimum calibrated limit(0.220 amps for NKT sensor and 0.400 amps for bosch sensor) and/or an open or short is detected.
Here are the possible causes for this:
·Blown fuse
·Short to VPWR in harness or HO2S
·Water in harness connector
·Open VPWR or GND circuit
·Low battery voltage
·Poor electrical connections from PCM to HO2S sensor
·HO2S heater
·PCM

Now the reason I ask what the codes were is that may help in determining what is wrong. If the other codes you had were also O2 heater cicuit codes example P0135, P0155, P0161 then you may need to be looking at something other than the O2's themself and maybe more toward a blown fuse no. 24 (15amp) in the under hood fuse box,wiring harness problem on the voltage side since all four share this one or a bad PCM.

Posted on Mar 19, 2009

SOURCE: Ford Mondeo failed its MOT exhaust emisson test

The advice that the garage gave you seems right. If any bushes were worn they would show up on the MOT Test. Try taking it to another garage to check out the Cat for your peace of mind.

Posted on Nov 28, 2008

morse008
  • 1111 Answers

SOURCE: FAILED EMISSIONS

possible but could be head gasket or valves , or worn rings and is by passing the pistons going straight out the end ...or maby settings are wrong ? try carb cleaner and inspect visually air-filter etc.

Posted on Aug 26, 2009

motor1258
  • 6674 Answers

SOURCE: emission test showed error code p1443.check engine

You might want to try "google images" just type in your vehicle and what your looking for. Here's an example (link) of what to look for.

http://www.fordmuscle.com/forums/attachments/all-ford-techboard/4132d1212515121-code-p1443-help-96tbird_evap.jpg

Posted on Oct 25, 2009

  • 157 Answers

SOURCE: 2004 f150 5.4 triton 4x4. Engine started missing

change the o2 sensors and this will correct the problem dont forget to have the light turned back out

Posted on Dec 01, 2010

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1 Answer

95 taurus with re manufactured 3.0l engine from ford runs rich at idle fails emission test. no codes, new motor from ford has 750 miles since install. o2 sens have been replaced no change still no codes...


check fuel pressure/volume, injectors, engine temp sensor for computer to know what the engine temp is, map sensor, timing, throttle position sensor. what emission did it fail might help.

Feb 12, 2015 | Ford Cars & Trucks

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Runs rich


Bad fuel pressure regulator.

Mar 30, 2014 | 1995 Ford Taurus

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Emission test failed HC (PPM)


i can be, only 2 things, or both.
1: engine running way too rich.
2: dead cat.
(both happens, too)
replace the cat, might be cheaper that full engine diagnosis and repair.
in a real shop we test the cat. using up and down stream tests.
with the 5 gas analyser.
but the truth is a new CAT can hide a very filthy running motor.

Mar 12, 2013 | 1995 Geo Prizm

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Check engine lite on had scanned said o2 sensor


You have 2 of them,one in the exhaust manifold,the other after the cataylac converter.

Dec 17, 2012 | 2000 Chevrolet Impala

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Code 42 ego always rich what is ego


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

Dec 07, 2012 | 1988 Ford F 150

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Car has about 90,000 miles on it and all of a sudden it has begun using oil at the rate of 1 qt per 250 miles. No oil in the water, no exhaust smoke and runs smooth with power,.


go to an exhaust shop and have a smog test performed in which the hydrocarbon emissions of your vehicle will be measued. It's got to be going somewhere right. Excess oil or a vehicle running too rich will cause O2 sensors to foul out and catalytic converter the ceramic catalyst insert to break down over time which would cause further problems

Apr 28, 2011 | 1996 Ford Explorer

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Failed mot due to excess emissions but why are there excess emissions?


have code read test doen for free at a auto parts store...it may be an O2 sensor or EGR valve...the code test should tell you

Jan 24, 2011 | 1995 Isuzu Trooper

2 Answers

I took my truck to emissions and the carbon minoxide is at 125 and the limit is 25. What would cause such a deadly emission so high over the limit?


excessive carbon monoxide is usually the result of very rich mixtures. Here are some causes for rich mixtures:
1. leaking fuel injector(s)
2. excessive fuel pressure at the injectors.
3. ruptured fuel pressure regulator diaphragm
4. crankcase fuel contamination (from leaking injectors)
5. plugged PCV valve or hose
6. closed loop control system incorrectly shifted rich (bad O2 sensor)
7. false input signal to ECM due to bad sensor(s).

Jan 21, 2009 | GMC S-15 Cars & Trucks

1 Answer

1999 vw jetta 2.0


Sounds like two problems. P0300 and P0303 are possibly spark plugs. They could be a coil pack but I'm leaning toward a spark plug problem because of the other two codes - they're indicating O2 sensor problems. If the O2 sensors are screwed up, the car reverts to preprogrammed, rich fuel maps that send excessive fuel through the engine. The reasoning is, if the ECU can't trust the O2 sensors to determine how much fuel to burn optimally, it'll pump a bunch of extra fuel through the engine to keep it safe. Having too little fuel (aka running lean) can destroy an engine, so the ECU plays it safe and runs rich (too much fuel) instead. The consequences of rich running are relatively minor compared to lean running, but can and do tend to create excessive carbon buildup on the catalytic converter and O2 sensors, as well as fouling spark plugs.

First thing to do though is to swap the wires on your coil packs and see if you end up with a misfire code for the same cylinder #3. If you do, then it's the plug or wire. If it moves, it's the coilpack. Replace whichever part is faulty. You'll probably need oxygen sensors too, before you can clear all the codes.

Aug 27, 2008 | 1999 Volkswagen Jetta

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