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Error Codes of focus 2001

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gtamarizch

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Discussion starter · #1 ·
I have Problems with my focus 2001, the mechanic to scan the car, the computer give this codes:

ALL DTC (CODES)
ENG MIL P0135
02S HEATER CKT
MALFUNCTION 1/1

ENG MIL P0141
O2S HEATER CKT
MALFUNCTION 1/2

ENG PENDING P0136
02S CKT MALFUNCTION 1/2

ENG NON-MIL P1000
OBD SYSTEMS READLINESS TEST NOT
COMPLETE

ENHANCED

the mechanic says you have to change the oxygen's sensor's of the cars, but i don't know if that the solution because i'm really did it and nothing change always i have the light on the dash, check engine it's on. what i can do somebody help me please to find the answers of my problems
 
#2 ·
Here's the DTC codes with a bit more detail and things to check:

P0135 - HO2S Sensor Circuit Malfunction (HO2S-11) During testing the HO2S Heaters are checked for opens/shorts and excessive current draw. The test fails when current draw exceeds a calibrated limit and/or an open or short is detected.
Short to VPWR in harness or HO2S.
Water in harness connector.
Open VPWR circuit.
Open GND circuit.
Low battery voltage.
Corrosion or poor mating terminals and wiring
Damaged PCM Wiring.
Damaged HO2S heater.
Damaged PCM.

P0136 - HO2S Sensor Circuit Malfunction (HO2S-12) The downstream HO2S sensor(s) are continuously checked for maximum and minimum voltages. The test fails when the voltages fail to meet the calibrated limits.
Pinched, shorted, and corroded wiring and pins.
Crossed sensor wires.
Exhaust leaks.
Contaminated or damaged sensor.

P0141 - HO2S Sensor Circuit Malfunction (HO2S-125) See DTC P0135

So basically the codes may indicate a problem with the wiring harness and connectors, not necessarily the sensors themselves. If you've already replaced the sensors, check for burnt, crimped or damaged wires and clean the wiring connectors and check for bent pins. Trace the wires back from the O2 sensors in the exhaust to the main wiring harness.
Hope that helps.
 
#3 ·
Check for a bad fuse to the O2 heater circut.
P0135 - HO2S Sensor Circuit Malfunction (HO2S-11) During testing the HO2S Heaters are checked for opens/shorts and excessive current draw. The test fails when current draw exceeds a calibrated limit and/or an open or short is detected. Short to VPWR in harness or HO2S.
Water in harness connector.
Open VPWR circuit.
Open GND circuit.
Low battery voltage.
Corrosion or poor mating terminals and wiring
Damaged HO2S heater.
Damaged PCM.
Wiring.
Damaged HO2S heater.
Damaged PCM.

P0136 - HO2S Sensor Circuit Malfunction (HO2S-12) The downstream HO2S sensor(s) are continuously checked for maximum and minimum voltages. The test fails when the voltages fail to meet the calibrated limits. Pinched, shorted, and corroded wiring and pins.
Crossed sensor wires.
Exhaust leaks.
Contaminated or damaged sensor
 
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#4 ·
That is so funny, we posted at the same time
 
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#5 ·
Check fuse #18 in the under hood fuse box first. That is the circuit for the O2 sensor heaters. That might be your only problem.

P1000 can be ignored. It means that you've either replaced the battery recently, or your battery has been disconnected. It might also mean that one of your battery terminals is loose or has a bad connection.
 
#6 ·
whynotthinkwhynot said:
Check fuse #18 in the under hood fuse box first. That is the circuit for the O2 sensor heaters. That might be your only problem.

P1000 can be ignored. It means that you've either replaced the battery recently, or your battery has been disconnected. It might also mean that one of your battery terminals is loose or has a bad connection.
Click to expand...
another tidbit to that P1000 will stay logged but not throw a CEL/MIL, the computer will auto delete it after 50 successful restarts of the engine without loosing power... this was implemented in the vehicles to notify Emissions computers that the vehicle may of had codes prior.. a few shops around here will not Emission vehicles till the P1000 has disappeared
 
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#8 ·
Did you have the codes cleared after you replaced the sensor ? If not, it will take a few cycles to clear the code.....unless there really is another issue of course.

Also there are 2 oxygen sensors, if you replaced the good one rather than the bad one, it won't have fixed the codes. I don't believe the downstream sensor has a heater (but I could be wrong) so that looks upstream sensor codes (the one on the manifold in the engine bay)
 
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