Question about 1998 Mercury Villager

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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) But still my check engine light on with code PO135. I use Actron scanner. What could be problem? what can I do next to get check engine to fix?

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  • cchalverson Feb 24, 2009

    My wife's 97 Quest, 137,000 miles triggered the CEL with the PO135 code. I've replaced the front(bank 1, sensor 1) HO2 sensor, reset the CEL and the CEL just came back on. My mechanic checked out the wiring as OK and suspected the new HO2 sensor was faulty, so we replaced the front HO2S again and again the very same CEL result. I'm having to expand my mechanical logic beyond the apparent HO2S.

  • mathewandnis Feb 28, 2009

    It was a broken wire. I took it to dealer, they found it.

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  • Mercury Master
  • 4,369 Answers

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.

Posted on Feb 24, 2009

  • gerry bissi Feb 28, 2009


    A common failure in the V/Q is a broken heater wire in the cable. If a heater circuit failure code is present, fix the broken harness wire and leave the sensor alone. Usually this occurs just beyond the connector under the cable wrapping. (Heater DTC are always true codes and never false).

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Codes po122 po155 po135 po102


code po122 is for your throttle position sensor. po155 is for your down stream o2 senor .po135 is for your bank 1 sensor 1 o2 sensor. po102 is for your maf sensor

Dec 19, 2012 | 2000 Ford Expedition

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2005 dodge grand caravan 3.8 code po135 in stalled new botch o/2 sensor cleared codes drove van check eng light came back on same code whats is going on


Code 135 is for a faulty heater in the O2 sensor. Since you have replaced the sensor the problem is probably the circuit or the power source for the heater.
You'll need to check the heater circuit next.

Jul 29, 2012 | Cars & Trucks

1 Answer

Engine has severe miss @ idle under load. Runs fine when driving. Plug and Plug Wires are Ok. Put on a Scanner and got code Po135.


The DTC (Data Trouble Code) P0135 is for the O2 sensor Heater Circuit Bank 1 Sensor 1. Bank 1 will always be the cylinder bank with the number one cylinder and spark plug, and the number one O2 sensor will be located before the catalytic converter and usually at the rear of the exhaust manifold or just after it. According to the firing order diagram bank one is the cylinder bank that is closest to the fire-wall and there should be an O2 sensor located there around the rear of the exhaust manifold or just after it. If the engine is a 4 cylinder then it will be the O2 sensor before or up-stream of the catalytic converter. Check for any damaged wiring or loose wire connector at the O2 sensor and if they are alright then replace the O2 sensor and then re-set the check engine light. (The auto part store should re-set the check engine light for you if you purchase the O2 sensor from them, and be certain that it is the correct and assembled O2 sensor for your vehicle and not a put together universal O2 sensor)




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Nov 29, 2010 | 1996 Mercury Mystique

2 Answers

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

Aug 15, 2010 | 1998 Honda Civic

2 Answers

Senor oxgen 2nd bank downstream Where are they located


you have 4 o2 sensors and 4 catylitic converters. bank 1 sensors are located on the passenger side exhaust. #1 is before the catylitic converters and #2 is after. bank two, on the drivers side, has the same configuration, the downstream sensor is after the cats.

May 20, 2010 | 2001 Mercury Grand Marquis

2 Answers

Check engine light on my 2003 sienna, DTC was



Oxygen Sensor Connector locations

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  1. Disconnect the oxygen sensor connector.
  2. Using an ohmmeter, measure the resistance between the terminals +B and HT. Resistance specification: 11 - 16 ohms at 20°C (68°F).
  3. If the resistance is not as specified, replace the sensor.
  4. Reconnect the oxygen sensor connector.

Oxygen Sensor testing

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I really hope helped with this. Remember rated this help, good luck.

Nov 30, 2009 | 2003 Toyota Sienna

1 Answer

No heat sensor 1 bank 1 did back probe is there a relay or fuse


There is a fuse (fuse #4) for the heated O2 sensor. Make sure the fuse is good and that there is not an open circuit to the power source.

Jul 14, 2009 | 1997 Nissan Quest

2 Answers

Check engine light is on


P0135 02 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)
P0136 02 Sensor Circuit Malfunction (Bank I Sensor 2)
check for a blown fuse, if it is blown replace it, if it blows again after engine is started you have either a shorted O2 sensor or the wiring leading to the up stream or down stream sensors.

Apr 22, 2009 | 2001 Chevrolet Metro

2 Answers

98 mercury villager OBD I code P0135


This code refers to the front oxygen sensor on Bank 1. The heated circuit in the oxygen sensor decreases time needed to enter closed loop. As the O2 heater reaches operating temperature, the oxygen sensor responds by switching according to oxygen content of the exhaust surrounding it. The ECM tracks how long it takes for the oxygen sensor to begin switching. It the ECM determines (based on coolant temp) that too much time elapsed before the oxygen sensor began operating properly, it will set P0135.
Repair short or open or high resistance in wiring harness or harness connectors.
Since you have already changed out your O2 sensor (as long as you used to OEM replacement and not the "Universal" replacement) you should not have to replace it again. You might check your thermostat to part of the time it takes for the O2 sensor to start switching being based on coolant temp, if your thermostat is not operating properly, it could cause the coolant temp to take longer than what is considered by the ECM to be normal.

Feb 22, 2009 | 1998 Mercury Villager

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