'94 Accord "Check Engine" light - Honda Accord Forum - Honda Accord Enthusiast Forums


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Old 11-26-2007, 08:15 PM
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Default '94 Accord "Check Engine" light

Hi All!

94 Accord LX. The "check engine" light came on as I started the car to come home from work today.

Any ideas of what to look for?

175K miles.

Thanks!
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Old 11-26-2007, 08:51 PM
 
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Default RE: '94 Accord "Check Engine" light

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Old 11-26-2007, 09:45 PM
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Default RE: '94 Accord "Check Engine" light

Thanks 2POINTaut0:

It appears that I have codes 41 (Primary Oxygen sensor, Heater Circuit malfunction) and 3 (MAP...Manifold Absolute Pressure defective circuit/sensor) set.

Any further ideas????

Thanks a bunch!
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Old 11-26-2007, 10:04 PM
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Default RE: '94 Accord "Check Engine" light

you can check the sensor heater circuit with an ohm meter, and this link;http://img139.imageshack.us/my.php?i...acode41no7.jpg
The map sensor code could be caused by a vacum leak or sticking EGR valve.
Worth the effort to reset it and try to determine the conditions that cause it to set
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Old 11-26-2007, 10:13 PM
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Default RE: '94 Accord "Check Engine" light

Thanks for the help Hondadude:

How do you reset the codes? I'd like to try this and see what the result is.

Thanks for the response!

Have Ohm meter and will try the link as well....
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Old 11-27-2007, 12:12 AM
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Default RE: '94 Accord "Check Engine" light

Pull the 7.5 amp radio (backup) fuse in the box in the engine bay for a minute. This will clear the ECU/TCU and also wipe out the stations programmed in the radio. Make sure that you have the code (I feel like I am writing the Haynes manual right now!)


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Old 11-27-2007, 09:37 AM
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Default RE: '94 Accord "Check Engine" light

Quote:
ORIGINAL: PAhonda

Make sure that you have the code (I feel like I am writing the Haynes manual right now!)
HAHA! Half of the print in the Haynes manual looks like this: "WARNING! The radio in your vehicle has a security code......"
I swear...why can't they tell you once in the first chapter and not bug you every time you disconnect the battery!
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Old 11-27-2007, 11:46 AM
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Default RE: '94 Accord "Check Engine" light

Cuz people are stupid, and stupid people do stupid things.
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Old 11-27-2007, 11:50 AM
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Default RE: '94 Accord "Check Engine" light

Did the 94's have a security code?
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  #10  
Old 12-01-2007, 10:43 AM
 
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Default RE: '94 Accord "Check Engine" light

most likely the heater is shot in the o2 sensor. as far as code 3...that's tricky. if it's a hard failure(recodes directly after clearing the code and warming up the car) then it is easier to diagnose. see what happens.
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