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96 Ford Taurus, code kicking that ALL 4 oxygen sensors are bad. Since all 4 usually do not go bad all at once, what else could be kicking that code?

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  • wndipoo Feb 08, 2010

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Good day, it could be the mass air flow sensor (maf). have it checked and hope to get your car back to normal running. hope this helps, have a nice day

Posted on Feb 08, 2010

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What does the codes p0442,p0136 &p0141 mean on my 2001 ford taurus it failed inspection for these codes


P0442 FORD - Evaporative Emission System Leak Detected Small Leak

Possible causes- Missing or loose fuel cap
- Incorrect fuel filler cap used
- Fuel filler cap remains open or fails to close
- Foreign matter caught in fuel filler cap
- EVAP canister or fuel tank leaks
- EVAP system hose leaking
- Fuel tank leaking
P0136 - O2 Sensor Circuit Malfunction Bank 1 Sensor 2
Possible causes- Rear Heated Oxygen Sensor Bank 1 harness is open or shorted
- Rear Heated Oxygen Sensor Bank 1 circuit poor electrical connection
- Faulty Rear Heated Oxygen Sensor Bank 1
- Inappropriate fuel pressure
- Faulty fuel injectors
- Intake air leaks may be faulty
- Exhaust gas leaks

P0141 FORD - O2 Heater Circuit Bank 1 Sensor 2

Possible causes- Faulty Heated Oxygen Sensor (H2OS) Bank 1 Sensor 2
- Heated Oxygen Sensor (H2OS) Bank 1 Sensor 2 circuit fuse
- Heated Oxygen Sensor (H2OS) Bank 1 Sensor 2 circuit open shorted to ground
- Heated Oxygen Sensor (H2OS) Bank 1 Sensor 2 circuit poor electrical connection
- Faulty Engine Control Module (ECM)

Sep 27, 2012 | 2001 Ford Taurus

1 Answer

2006 Ford Taurus code P0152


Common Problems That Trigger the P0152 Code
  • Defective Oxygen Sensor
  • Faulty Oxygen Sensor wiring or connections
  • Shorted Oxygen Sensor Heater element(s)
Common Misdiagnoses
  • Oxygen Sensor is replaced when the problem is faulty Oxygen Sensor wiring or connections
  • Oxygen Sensor is replaced when the problem is an over-reporting Mass Air Flow Sensor, clean mass air flow sensor first, to see if thats the problem. good-day ! just type this in search on pc. 02 sensor symtoms, and it will give you the details of a bad sensor.

Apr 27, 2012 | 2006 Ford Taurus

1 Answer

I have a 2000 Ford Taurus, ran out of gas the other week, came home the next day put fuel in it, and got a mean sputter, so we flush the fuel lines out, but at the same time this man adjusted the...


Whenever I get a vehicle in that "sputters" the first things we check is the fuel filter and pressure on the fuel pump. With the 1995 and newer cars the computer will kick out error codes if the oxygen sensors are defective.

Sep 11, 2011 | 2000 Ford Taurus

1 Answer

Code 430 and 420


Wow!, I answered this about 30 minutes ago, but somehow my answer didn't post.

Fault code 420 is Catalyst system efficiency below threshold, ( bank 1 )
Fault code 430 is the same as above but, ( bank 2 )

Fault codes do not determine what part is bad, they just reduce the field for troubleshooting.
This is what I would have checked;
1. Oxygen sensor, upstream ( meaning before the catalytic converter )
2. Oxygen sensor, downstream ( meaning after the catalytic converter )
3. MAF, ( mass air flow ), sensor
4. Idle air control sensor.

Your problem will be with the emission system.

I hope this helps you.

Feb 10, 2011 | 1999 Ford Taurus

1 Answer

I've got a CEL P0420 code on a 96 Civic. I've used a scanner tool, and it appears to be a Catalyst issue based on the O2 sensor readings. Both follow about the same frequency. However, I am seeing a Closed...


This code can mean any of the following and not a necessarily bad catalytic converter

A code P0420 may mean that one or more of the following has happened:
  • Leaded fuel was used where unleaded was called for
  • An oxygen sensor is not reading (functioning) properly
  • The engine coolant temperature sensor is not working properly
  • Damaged or leaking exhaust manifold / catalytic converter / exhaust pipe
  • Retarded spark timing
  • The oxygen sensors in front and behind the converter are reporting too similar of readings
Check the following
  • Check for exhaust leaks at the manifold, pipes, catalytic converter. Repair as required.
  • Use a scope to diagnose the oxygen sensor operation (Tip: The oxygen sensor in front of the catalytic converter normally has a fluctuating waveform. The waveform of the sensor behind the converter should be more steady).
  • Inspect the downstream heated oxygen sensor (HO2), replace if necessary
  • Replace the catalytic converter

Nov 13, 2009 | 1997 Ford Taurus

3 Answers

How much is a 202 sensor for 1996 ford taurus


Try calling a parts store in fact try calling a few for different prices

Nov 05, 2009 | 1996 Ford Taurus

2 Answers

My daughter has a 02 Ford Taurus and the engine light came on. We were told the problem code was a 420 but they could not diagnose the problem. They turned the light off but soon it came back on. Any...


What was the letter in front of the 0420 (i.e. P or B) if it was a P then the code is for a catalytic effenciency code. this usually caused by a lazy or an O2 sensor that is going out, or the catalytic converter itself is going out. The only way to really find the problem is to hook it up to a diagnostic code reader and monitor the O2 sensors for their flucuations and see if one is not lazy or not reading at all, if the sensors are flucuating then i would lean towards a catalytic converter. Hope this helps you out.

Oct 20, 2009 | 2002 Ford Taurus

2 Answers

96 intrepid 3.5 litre, wont start


did you check for spark at the plugs. becuase oxygen sensor wont prevent the car from starting. let me know about the spark.

Feb 13, 2009 | 1996 Dodge Intrepid

1 Answer

Oxygen Sensors 1995 Ford Taurus


Replace them Both. There is no way to tell which one is sending the Codes.

Jan 04, 2009 | 1995 Ford Taurus

2 Answers

1996 Ford Taurus Chugging MAF


Did you buy a Ford MAF sensor? There are some brands that are not reliable or accurate. Buy a Ford MAF sensor, if your mechanic has decided that the MAF is faulty. You may have a leaking fuel injector, bad coolant temp sensor,bad oxygen sensor,dirty air filter, clogged exhaust system.

Aug 25, 2008 | 1999 Ford Taurus

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