attn: E Powers Auxiliry Emissions

I had the check engine light checked at Auto Zone today. I saw for myself that "Manufacturer Auxiliary Emissions" is what came up on the machine. No code, just that. Any idea what it means? The Auto Zone guy said he had no clue. I am getting 11 mpg and it is a 97 4.0 4X4.

Never heard of that reading but it does not mean it does not exist. I don't know what kind of OBD test equipment Auto Zone uses but perhaps a more sophisticated diagnostic equipment used by service mechanics may shed some light on your problem.

try a different autozone if you can. maybe that reader is broke. we need the EXACT code number the ones listed in bold and underlined because this is what is listed for Auxiliary Emission Control OBDII DTC’s
and some involve replacing the part but there is too much to just guess also it could be as cheap and easy as replacing the gas cap because that code is listed also

# P0400 Exhaust Gas Recirculation Flow Malfunction
# P0401 Exhaust Gas Recirculation Flow Insufficient Detected
# P0402 Exhaust Gas Recirculation Flow Excessive Detected
# P0403 Exhaust Gas Recirculation Circuit Malfunction
# P0404 Exhaust Gas Recirculation Circuit Range/Performance
# P0405 Exhaust Gas Recirculation Sensor A Circuit Low
# P0406 Exhaust Gas Recirculation Sensor A Circuit High
# P0407 Exhaust Gas Recirculation Sensor B Circuit Low
# P0408 Exhaust Gas Recirculation Sensor B Circuit High
# P0410 Secondary Air Injection System Malfunction
# P0411 Secondary Air Injection System Incorrect Flow Detected
# P0412 Secondary Air Injection System Switching Valve A Circuit Malfunction
# P0413 Secondary Air Injection System Switching Valve A Circuit Open
# P0414 Secondary Air Injection System Switching Valve A Circuit Shorted
# P0415 Secondary Air Injection System Switching Valve B Circuit Malfunction
# P0416 Secondary Air Injection System Switching Valve B Circuit Open
# P0417 Secondary Air Injection System Switching Valve B Circuit Shorted
# P0418 Secondary Air Injection System Relay .A” Circuit Malfunction
# P0419 Secondary Air Injection System Relay “B. Circuit Malfunction
# P0420 Catalyst System Efficiency Below Threshold (Bank 1)
# P0421 Warm Up Catalyst Efficiency Below Threshold (Bank 1)
# P0422 Main Catalyst Efficiency Below Threshold (Bank 1)
# P0423 Heated Catalyst Efficiency Below Threshold (Bank 1)
# P0424 Heated Catalyst Temperature Below Threshold (Bank 1)
# P0430 Catalyst System Efficiency Below Threshold (Bank 2)
# P0431 Warm Up Catalyst Efficiency Below Threshold (Bank 2)
# P0432 Main Catalyst Efficiency Below Threshold (Bank 2)
# P0433 Heated Catalyst Efficiency Below Threshold (Bank 2)
# P0434 Heated Catalyst Temperature Below Threshold (Bank 2)
# P0440 Evaporative Emission Control System Malfunction
# P0441 Evaporative Emission Control System Incorrect Purge Flow
# P0442 Evaporative Emission Control System Leak Detected (small leak)
# P0443 Evaporative Emission Control System Purge Control Valve Circuit
# P0444 Evaporative Emission Control System Purge Control Valve Circuit
# P0445 Evaporative Emission Control System Purge Control Valve Circuit Shorted
# P0446 Evaporative Emission Control System Vent Control Circuit Malfunction
# P0447 Evaporative Emission Control System Vent Control Circuit Open
# P0448 Evaporative Emission Control System Vent Control Circuit Shorted
# P0449 Evaporative Emission Control System Vent Valve/Solenoid Circuit Malfunction
# P0450 Evaporative Emission Control System Pressure Sensor Malfunction
# P0451 Evaporative Emission Control System Pressure Sensor Range/Performance
# P0452 Evaporative Emission Control System Pressure Sensor Low Input
# P0453 Evaporative Emission Control System Pressure Sensor High Input
# P0454 Evaporative Emission Control System Pressure Sensor Intermittent
# P0455 Evaporative Emission Control System Leak Detected (gross leak)
# P0460 Fuel Level Sensor Circuit Malfunction
# P0461 Fuel Level Sensor Circuit Range/Performance
# P0462 Fuel Level Sensor Circuit Low Input
# P0463 Fuel Level Sensor Circuit High Input
# P0464 Fuel Level Sensor Circuit Intermittent
# P0465 Purge Flow Sensor Circuit Malfunction
# P0466 Purge Flow Sensor Circuit Range/Performance
# P0467 Purge Flow Sensor Circuit Low Input
# P0468 Purge Flow Sensor Circuit High Input
# P0469 Purge Flow Sensor Circuit Intermittent
# P0470 Exhaust Pressure Sensor Malfunction
# P0471 Exhaust Pressure Sensor Range/Performance
# P0472 Exhaust Pressure Sensor Low
# P0473 Exhaust Pressure Sensor High
# P0474 Exhaust Pressure Sensor Intermittent
# P0475 Exhaust Pressure Control Valve Malfunction
# P0476 Exhaust Pressure Control Valve Range/Performance
# P0477 Exhaust Pressure Control Valve Low
# P0478 Exhaust Pressure Control Valve High
# P0479 Exhaust Pressure Control Valve Intermittent
# P0480 Cooling Fan I Control Circuit Malfunction
# P0481 Cooling Fan 2 Control Circuit Malfunction
# P0482 Cooling Fan 3 Control Circuit Malfunction
# P0483 Cooling Fan Rationality Check Malfunction
# P0484 Cooling Fan Circuit Over Current
# P0485 Cooling Fan Power/Ground Circuit Malfunction

Took it to another mechanic and it came up EVAP like I said about a year ago. That leaves P440 to P455. I have replaced the gas cap. Also the Purge Solenoid and all hoses in the emissions. Went to the Ford Dealership and they tried to sell me a new Ranger...... like I'm going through this again. Ford said the engine was worn, it has 123,000 miles.

123,000 miles is not worn.... that is just broke in. you should have 70,000 miles before need for a new engine (5 years) try replacing the dpfe sensor to the plastic one.

I changed the DPFE last year. Also the fuel pump in the gas tank. That was reccomended by Ford also, cost $500 and didn't fix it. For some reason the "Check Engine" light is coming on and giving me 11mpg. I do have 31's on the truck, but really think it's the engine. :banghead: I'm about ready to trade it in and let someone else suffer! Problem is, I have put so much money in it so far I hate to lose what I have put into it.

I changed the DPFE last year. Also the fuel pump in the gas tank. That was reccomended by Ford also, cost $500 and didn't fix it. For some reason the "Check Engine" light is coming on and giving me 11mpg. I do have 31's on the truck, but really think it's the engine. :banghead: I'm about ready to trade it in and let someone else suffer! Problem is, I have put so much money in it so far I hate to lose what I have put into it.the metal dpfe sensors are junk and have been known to go bad new
how ever i have a community that consists solely of 4.0 rangers. see if they can help. they will know about the 4.0 then i do

http://www.rangerpowersports.com/forum/forumdisplay.php?f=11

Thanks E Powers, but they aren't taking new members......:frown:

sorry they had to close it do to trolls, people who get banned and reregister just to be a nuisance i emailed them about you and we will see shortly.