P0133 - Oxygen Sensor Circuit Slow Response (Bank1, Sensor1)
This involves the front oxygen sensor on Bank 1. This code indicates the engine air fuel ratio is not being adjusted by the oxygen sensor signal or the ECM as expected to do so, or not adjusted as often as expected to do so once the engine is warmed or under normal engine use.
Symptoms: You will likely not notice any drivability problems, although there may be symptoms.
Causes: A code P0133 may mean that one or more of the following has happened:
* The oxygen sensor is faulty
* The wiring to the sensor is broken / frayed
* There is an exhaust leak
Possible Solutions: The simplest thing to do is to reset the code and see if it comes back.
If the code comes back, the problem is more than likely the front Bank 1 oxygen sensor. You will likely wind up replacing it but you should also consider these possible solutions:
* Check and fix any exhaust leaks
* Check for wiring problems (shorted, frayed wires)
* Check the frequency and amplitude of the oxygen sensor (advanced)
* Check for a deteriorating / contaminated oxygen sensor, replace if necessary
* Check for inlet air leaks
* Check the MAF sensor for proper operation
P1131 Here's the bulletin, this TSB article is being republished in its entirety to update the Service Procedure.
FORD: 1997-98 EXPEDITION, F-150
, F-250 LD
LINCOLN: 1998 NAVIGATOR
The Malfunction Indicator Lamp (MIL) may illuminate and Diagnostic
Trouble Codes (DTCs) P0133, P0171 and/or P1131 may be stored in memory.
Additionally, there may be one or more of the following driveability
Near stall or stall at idle
Detonation on acceleration
This may be caused by cold condensate from the A/C system dripping
onto the Heated Exhaust Gas Oxygen (HEGO) sensor causing thermocycling
of the HEGO sensor .
Divert water from dripping onto the sensor by installing a
fabricated drain tube to the end of the A/C drain. This should reroute
the water and reduce the possibility of the above conditions occurring.
Refer to the following Service Procedure for details.
Fabricate a drain tube from PCV Vent Tube (F85Z-6758-BA). To create
the drain tube extension, remove the rubber cylinder from the plastic
tube and discard. Cut the plastic tube (Figure 1).
Remove the transmission fluid level indicator.
Remove the right front wheel.
Remove the right front fender well splash guard.
Clean the area around the transmission filler tube and then remove
the tube. Be sure to cover the hole using duct tape (or equivalent) to
prevent contaminants from entering the transmission.
Replace the right front HEGO Sensor (F88Z-9F472-AB) and leave the connector disconnected.
Modify the PCV vent tube (Figure 1) to make a drain for the A/C condensate drain.
Using needle nose pliers or equivalent, stretch the drain tube elbow fitting for ease of installation.
Refer to Figure 1 and fabricate a tool using a 61x2.5 cm (24x1") I.D. pipe as shown.
Lubricate the elbow with water.
NOTE: DO NOT USE SILICONE TO LUBRICATE THE ELBOW AS IT WILL FALL OFF.
Using the tool, install the modified drain tube at the 7:00 position toward the frame (Figure 2).
Clean the transmission filler tube.
NOTE: BE CAREFUL NOT TO DAMAGE THE O-RING AS THIS COULD CREATE LEAKS OR ALLOW CONTAMINATION INTO THE TRANSMISSION.
Lightly lubricate the transmission filler tube O-ring with petroleum jelly and reinstall the tube into the transmission.
Torque the bolt to 11-14 N-m (8-10 lb-ft).
NOTE: MAKE SURE THE BODY SIDE HEGO WIRING CONNECTOR IS IN THE LOCATOR HOLE IN THE BACK OF THE HEAD.
Connect the right front HEGO sensor connector.
Start the vehicle and verify water flow direction. Make sure no condensation drips onto the exhaust manifold bolt.
Reinstall the right front splash guard.
Reinstall the right front wheel.
Clean and reinstall the transmission fluid level indicator.
NOTE: DEALERS MUST ALSO PERFORM TSB 97-26-19 TO REPROGRAM THE POWERTRAIN CONTROL MODULE (PCM).
PART NUMBER PART NAME
F85Z-6758-BA PCV Vent Tube
F88Z-9F472-AB Heated Exhaust Gas Oxygen (HEGO) Sensor
Hope helps (remember comment and rated this).