Question about 1996 Mazda 626
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Posted on Jan 02, 2017
p1407 is egr system no flow
p0303 is cylinder 3 misfire
po171 is fuel control system is lean
you might want to start by checking the mass airflow sensor bolts as they tend to come loose.and that should take care of the po171. check the hoses for the egr, if all is okay possibly the egr solenoid might be faulty. for the p0303 check the sparkplug on cylinder three and the spark plug wire, if you have an ohm meter you can check the resistance of the wire by hooking up your test leads to either end of the wire (after removing it from the engine) and make note of the resistance...then replace that wire and remove another one and test it the same way.. the results should be about the same, if you compare a shorter wire then the resistance will be slightly lower...just as if you test a longer wire it will be a little more. hope this helps
Posted on Mar 11, 2011
SOURCE: I connected a scan tool
My advise is to look at what moistcabbage had to say about your problem. Then I will add a little advise:
Put the P0171 on hold until you have a verified fix for the other 2 codes. Here's why:
A misfire causes raw fuel and air to be shoved down the exhaust as an unburned mixture (After all. that's what a misfire is.) This can cause the free oxygen level in the exhaust to rise and cause the lean code (P0171) From the EGR code that you have, I can tell that you have the 2.0L engine in your car. (This is not a valid code for the 2.5L) In this case, moistcabbage is sort-of correct. Thiscode actually indicates that the EGR valve does not move when the computer commands the EGR to open. (Which SHOULD also be producing a P0400 code, which is EGR no or low flow.) If P0400 is not present, then chances are that this is caused by the EGR sensor "lying" to the computer and telling it that the EGR is not opening when it really is. However, it also may be telling the truth and the computer just hasn't picked up on the low flow issue yet. Anyway, if the EGR is not moving, it could be caused by a vacuum leak, which will also cause your P0171code.
The logical order of this would be to check for obvious causes of misfire like the spark plug, wire, coil, and fuel injector and correct as necessary. Also check the EGR system out to find out what the cause of the EGR not moving code is. (And repar as necessary) Then clear the codes and drive the car to see if the P0171 code returns. If P0171 returns and the other codes stay gone, then you will have to check into oter possible causes of the lean code. Otherwise, I would not waste any time checking into a lean condition at all before the other two codes are confirmed fixed.
Posted on Mar 11, 2011
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