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On a 1998 Ford Taurus SE V6 the check engine light remains on computet showing PO135 Bank 1 Sensor 1 and PO155 Bank 2 Sensor 1 being the problem. Both these sensors are brand new. Any suggestions as to what the problem is?

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Hi. This will be a short in the ground section of the connecting wiring harness. You will need to find and Repair the short or open circuit in the connecting harness that connects to the affected O2 sensors. There may be high resistance in wiring harness or harness connectors, in this case. The sensors are not the culprit, due to the fact that the sensors have been replaced, as stated in your post. This is merely a harness or connector issue. Worst case scenario will be a faulty PCM. This is highly unlikely, but if the harness connectors and wiring test out ok, replace the PCM.

A simple multimeter or volt meter can be used to test the wiring at the connectors for open circuit. repair the wring or replace it entirely. Start by pulling the connectors and visible inspect the contacts for corrosion; then use the meter to test for an open or shorted harness.

Posted on Jul 07, 2010

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O2 sensor?


O2 sensors are always after the cat converter and HO2S sensors are always before the cat converter.
p0135 refers to heated oxygen sensor(HO2S) 1 bank 1-heater control--circuit malfunction
If it is a straight 6 cylinder engine with 2 cat converters it will be the sensor before the cat converter that connects to the manifold from pistons 1.2.3
If it is a V6 it will be the sensor that is in front of the cat converter that connects to the rear bank pistons 1.2.3. Use the special socket when removing/replacing the sensors to prevent wiring damage

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What does the codes p0442,p0136 &p0141 mean on my 2001 ford taurus it failed inspection for these codes


P0442 FORD - Evaporative Emission System Leak Detected Small Leak

Possible causes- Missing or loose fuel cap
- Incorrect fuel filler cap used
- Fuel filler cap remains open or fails to close
- Foreign matter caught in fuel filler cap
- EVAP canister or fuel tank leaks
- EVAP system hose leaking
- Fuel tank leaking
P0136 - O2 Sensor Circuit Malfunction Bank 1 Sensor 2
Possible causes- Rear Heated Oxygen Sensor Bank 1 harness is open or shorted
- Rear Heated Oxygen Sensor Bank 1 circuit poor electrical connection
- Faulty Rear Heated Oxygen Sensor Bank 1
- Inappropriate fuel pressure
- Faulty fuel injectors
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P0141 FORD - O2 Heater Circuit Bank 1 Sensor 2

Possible causes- Faulty Heated Oxygen Sensor (H2OS) Bank 1 Sensor 2
- Heated Oxygen Sensor (H2OS) Bank 1 Sensor 2 circuit fuse
- Heated Oxygen Sensor (H2OS) Bank 1 Sensor 2 circuit open shorted to ground
- Heated Oxygen Sensor (H2OS) Bank 1 Sensor 2 circuit poor electrical connection
- Faulty Engine Control Module (ECM)

Sep 27, 2012 | 2001 Ford Taurus

1 Answer

Which is bank 2 for the o2 sensor for post cat?


HiI!!
6 cyl. and 8 cyl. engines are divided into 2 Banks, standing in front of the Engine, the Bank 1 is the side where the #1 spark plug is (on V6 Ford Engines is on the PASSENGER SIDE). Bank 2 is on the DRIVERS SIDE.
Check the following diagram for HO2 sensor locations (This diagram applies to Ranger, Explorer and Mountaineer models) :
1kbron_121.gif


2 would be Bank 1 and 2A would be Bank 2.
Good Luck!! A HELPFUL - 4 THUMBS - rating for this solution would be greatly appreciated. Thank you for using FixYa.

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I have a check engine light on my ob2 reads po135 whats that ?


o2 sensor heater circuit malfunction bank 1 sensor 1 you need to replace the 02 sensor

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1 Answer

Where is bank 1 on a 2001 ford taurus?


If it was the upper o2 this is the one.This does not mean the o2 is bad,check the spark plugs and boots,and fuel pressure.The fuel ratio is not correct on that bank.

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Where is the Camshaft Position Sensor located on a


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I have a 1998 ford explorer v6 sohc 4.0 l. check engine light came on. Put it on a computer and it says the o2 sensor is slow responding in bank 1 sensor 1. where is this located???


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1 Answer

What does po135, p1131, and p0305 mean on a ford f250 with a 4.6L 2007


PO135 = Upstream Heated Oxygen Sensor Heater (HTR 11) circuit (Bank #1)

P1131 = Lack of upstream Heated Oxygen Sensor (HO2S 11) switch, sensor indicates lean (Bank #1)

P0305 = Cylinder #5 Misfire detected

It looks like you have two separate issues happening. Bank 1 would be the left side of the engine if you were standing in front of the truck looking at the engine. The "upstream" oxygen sensor will be on the exhaust pipe coming from the bank one side of the truck IN FRONT of the catalytic converter. From the codes, it appears that the upstream sensor has gone bad, but the oxygen sensor behind the catalytic converter, or "down stream" is fine.

The misfire on cylinder 5 on the right side of the engine, 2nd one from the front, could be something as simple as a fouled spark plug or a coil malfunction.

To identify if it is a bad coil, swap the #5 cylinder coil with another coil, and see if the misfire follows the relocated coil.

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1 Answer

Hi, Ineed asist, my car have two codes PO135 and PO1131 my car is ford ranger 1998 thanks for help mi


the code P0135 is for high resistance or short in wiring harness or oxygen sensor bank 1, bank 1 is the bank with cylinder number 1, check the harness wiring to the O2 sensor if all is ok you should replace the O2 sensor, the P1131(bank 1 lean) code is more than likely a resulting code from the P0135. Let me know if this helps

Jun 17, 2009 | 2001 Ford Taurus

1 Answer

My 98 villager have check engine light on with code PO135. I replaced bank 1 senor 1. after driving little bit same code came back again. then I replaced thermostat (the metar was always low, now it is ok)...


go to this website where there are files that will help you diagnose your issue.

http://autos.groups.yahoo.com/group/villagerquest/

P0135 is for heater circuit portion of the oxygen sensor circuit, not the sensor itself. It would just mean it's not heating the sensor so it will just delay the sensor controlling fuel trim until a few minutes later.

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