I Need Some Help With Trouble Codes P0175 And P0172 Bank 1 And Bank 2 To Rich. I Am Out Of Ideas. I Have Checked The Mass Air Flow Sensor, Fuel Regulator, And Fuel Injectors And Cant Figure Ot Why I Am Getting These Codes
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Can you share some of the data you collected? Fuel trims, engine load, O2 and MAF sensor readings under different conditions (idle, 2500 rpm, WOT) graphed would be nice. Throw in the baro pid as well. Maybe upload a movie?
Did you check exhaust backpressure and EGR operation?-Kai-
Chicago, IL -
This applies to Flexible Fuel vehicles only (8th digit of VIN = V). This is the text of Special Service Memo 17718 concerning 2001-2003 RANGER 3.0L FLEX FUEL - MIL ON WITH DTC P0171, P0172, P0174 OR P0175 SOME 2001-2003 RANGERS EQUIPPED WITH A 3.0L FLEX FUEL ENGINE MAY EXHIBIT THE MALFUNCTION INDICATOR LAMP (MIL) ON, WITH DIAGNOSTIC TROUBLE CODE P0171 (SYSTEM TOO LEAN BANK 1), P0172 (SYSTEM TOO RICH BANK 1), P0174 (SYSTEM TOO LEAN BANK 2) OR P0175 (SYSTEM TOO RICH BANK 2). DRIVABILITY SYMPTOMS MAY OR MAY NOT BE PRESENT. TO SERVICE, REPROGRAM THE PCM WITH THE LATEST CALIBRATION AVAILABLE.
Have the PCM checked for the latest flash available, also check and make sure the Flex Fuel Sensor is working properly.
1. Check the Flex Fuel (FF) sensor reading on the scan tool. If the vehicle fuel is straight gasoline, the Parameter Identification (PID) should indicate a reading between 40-60 hertz.
2. Check for battery voltage on the Light Blue/Orange (LB/OR) wire and check for a good ground on the Black (BK) wire at the FF sensor making sure both wires show good under a load. The sensor is located on the frame rail above the transmission crossmember.
3. Check the Dark Green/Light Green (DG/LG) wire between the FF sensor and PCM pin 34.
Inspect the C309 connector located below the driver seat area and is at the point where the harness passes from inside the cab to underneath the vehicle. This connection is subject to corrosion issues and contains the circuits of the sensor. Ford TSB 01-5-2 deals with connection problems at C309 and has part numbers for replacement terminals if needed.
4. If the circuits check OK but the sensor is out of range, verify the fuel does not contain high amounts of ethanol or alcohol. To do this, make 11 equal marks on a cylinder with straight sides and put in 10 parts of gasoline and one part water. Shake the mixture up and let it sit. The water will combine with the ethanol/alcohol in the fuel and normally settling to the bottom. There should be no more than about 2 parts water at the bottom.
5. If the fuel quality is OK but the sensor reads incorrectly, suspect a faulty FF Sensor.Comment
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+1 on what Dave said. If you see P0172 P0175 on GM and Ford Flex Fuel Vehicles, your next move should be to check the FF sensor to see what the ethanol% reading is. If it's high, and there's not that much ethanol in the fuel, you need to replace the sensor.
I'm sure this applies to a lot of car lines, but I only have personal experience with these.
On GM vehicles you will also need to do a FF Sensor Relearn.
Joe"You don't build a reputation on what you're going to do"
Henry FordComment
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