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 2003 Mazda B4000
2003 Mazda B4000
2003 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.
2003 Mazda B4000 Recalls (Recent)
Summary: MAZDA IS RECALLING MODEL YEAR 1995 THROUGH 1997 AND MODEL YEAR 2001 THROUGH 2003 TRUCKS EQUIPPED WITH TEXAS INSTRUMENTS SPEED CONTROL DEACTIVATION SWITCH (SCDS) AND/OR ANTI-LOCK BRAKE SYSTEM (ABS) AND MANUFACTURED ON OR BEFORE DECEMBER 5, 2002. A COMPONENT OF THE CRUISE CONTROL DEACTIVATION SWITCH MAY DETERIORATE OVER TIME AND DEVELOP A LEAK. THIS OCCURRENCE COULD CAUSE THE SWITCH TO OVERHEAT, SMOKE OR BURN WHICH COULD RESULT IN AN UNDER HOOD FIRE.Learn more »
2003 Mazda B4000 Questions and Answers
what is the schedule for changing the timing chain?
where is the pcv hose on my 2003 mazda b4000
checked alternator and wheel bearings and changed differenal fluid.
Heater blower is straining to run and sounds clogged. Mice attack our vehicles, so I'm thinking mouse nest in the blower assembly (happened on another truck we have).
2003 Mazda B4000 Reviews
I bought this truck new in 2003 and it now has 126,500 miles. It has been a fantastic vehicle. Super dependable and has never let me down. Other than regular maintenence, I haven't had to do a thing to it. Hands down, this has been the best new vehicle I have ever purchased.