What does the diagnostic code P0102 mean for a 2003 Jaguar S-Type?

Answer 1

Mass Air Flow (MAF) Circuit Low Input Basically this means that there is a problem with the Mass Air Flow (MAF) sensor or circuit. A more technical description would be that the MAF circuit had lower than expected voltage (air flow). You will likely not notice any serious drivability problems, although there may be symptoms such as a general decrease in power or sluggishness. A code P0102 may mean that one or more of the following has happened: * The MAF may be disconnected, or a wiring connection may be bad * The MAF may be dirty or otherwise contaminated (Note: if you use a reusable oiled air filter, be careful not to apply too much oil or that can contaminate the MAF). * The MAF sensor may be faulty * The vehicle computer may be faulty (very rare) The simplest thing to do is to reset the code and see if it comes back. Then start with the cheapest, easiest repair procedures: * Verify that the Mass Air Flow Sensor wiring is connected properly and that there are no broken / frayed wires. * Inspect for any air leaks near the MAF sensor. * Take the MAF out and clean it using a spray cleaner such as brake cleaner or electrical contact cleaner. Be gentle with the sensor. * Check the voltage of the MAF sensor (refer to a repair manual for vehicle specific information) * Replace the MAF sensor.