Water intrusion into a connector (X309) located under the cab, beneath the driver's seat, can cause a rough idle, erratic speedometer operation, ABS Light and Check Engine Light illumination, and automatic transmission shifting problems. If needed, connector repair parts are available from Mazda dealers, and possibly some Ford dealers.
Resources for the Repair and Maintenance of your 2004 Mazda B4000
2004 Mazda B4000
2004 Mazda B4000 Problems
If the engine cranks but does not start, it may be caused by a tripped inertia switch. Switch the key to "ON" and the fuel pump should be heard running for a second or two. Listen at the gas filler if necessary. The inertia switch is located on the firewall and can be tripped when the parking brake is set too hard and then released. The inertia switch should be reset, and will click when it is reset.
The engine may fail to start due to an electrically shorted sensor. Some of the sensors may internally short and not blow any fuses. A technician may find no spark and no operation of the fuel injectors in the diagnosis. One way a technician may isolate the defective sensor is by disconnecting sensors one by one to see if the engine starts.
A dirty, or contaminated mass airflow sensor (MAF) can cause the engine to run poorly. The Check Engine Light may or may not illuminate. MAF sensor related fault codes P0102 and/or P0103 may be stored. In some cases, carefully cleaning the sensor element will fix the problem. If not, replacement of the sensor may be required.
2004 Mazda B4000 Questions and Answers
transmisssion will not shift down in the morning. when i accelerate and take my foot off the gas pedal it will shift. then the transmission works perfectly
why would the truck have a crack in the cylinder head?
I drove in wet weather. overnight it froze. the truck wants to move and seems to go in gear. it will not roll in nutral or or in any gear for that matter. I think it may be ice build up or is it ...
Going down the highway truck runs steady, when i come to a stop sign, engine starts to overheat and engine runs rough and wants to die. codes are P0304,P0455 and sometimes P0316. Changed 4 of six s...
2004 Mazda B4000 Reviews
Rear brake do not last,I was told this is a constant problem with this truck B4000.
Seats can be uncomfortable for drives longer than 30-40 minutes. I have the 4x4 and suspension is loose, nauseating for passengers - though I have no problems with it. The display under the rear view mirror went out, but all in all, a very good and reliable truck. A good beater that doesn't quit!