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Circuit scv Lights came on. Code PO138. Mechanic replace oxygen senor. Next day lights come back on. Mechanic says that now BOTH the PO138 and now PO136 codes. He has to replace another sensor. Has 42,000 miles (just of 40K warranty). Is it normal to have to replace both back to back? Why is the PO138 code coming up when it was just replaced. When I pull out of the shop tomorrow another $220 poorer, will another O2 sensor die?

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6ya6ya
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Posted on Jan 02, 2017

  • 146 Answers

SOURCE: I have a2001 corolla with a code p1071.I was told

This is almost always caused by a failing mass air flow sensor. If you had it replaced with aftermarket you may want to replace with oem to avoild problems. Thanks P0171 Fuel System Too Lean (Bank 1)Possible Causes Setting Conditions Base engine "mechanical" fault affecting one or more cylinders Check for air leaks after the MAF sensor Check for air leaks in the Air Induction system (e.g., in the intake manifold) Check for air leaks in the exhaust manifold and in the exhaust pipes Exhaust leaks located in front of the AFS or HO2S location Fuel control sensor is out of calibration (e.g., ECT, IAT or MAP) Fuel delivery system supplying too little fuel during cruise or idle periods (e.g., faulty fuel pump or dirty, restricted fuel filter) Fuel injector (one or more) dirty or pressure regulator has failed HO2S has failed (it may be contaminated with fuel, silicone or water) Vehicle driven low on fuel or until it ran out of fuel

Posted on Jun 08, 2009

  • 14036 Answers

SOURCE: Code 25 for Toyota 3.0 3VZE

code 25 air fuel ratio lean condition indicated.POSSIBLE CAUSES- AIR LEAKS IN THE INTAKE MANIFOLD -EXHAUST MANIFOLD -EXHAUST PIPES- FUEL CONTROL SENSORS IS OUT OF CALIBRATION LIKE THE-ECT IAT MAF -LOW FUEL PRESSURE LIKE- FUEL FILTER CLOGGED PRESSURE REGULATOR FAILURE- ONE OR MORE FUEL INJECTORS RESTRICTED -HO2S ELEMENT IS CONTAMINATED DETERIORATED OR HAS FAILED -VACUUM HOSE IS DISCONNECTED BROKEN LEAKING OR LOOSE.

Posted on Jul 20, 2009

  • 1 Answer

SOURCE: The Toyota Camry engine light is on. Error Code P0125

Change bank 1 sensor 1 this will solve your problem. Tihs is a fuel issue nit a thermostat issue.

Posted on Oct 15, 2009

Testimonial: "I did what you suggested and it worked. Thanks. "

superjorge1
  • 8 Answers

SOURCE: have p0130 and p0133 codes 98 toyota tacoma

check the mass air flow sensor there maybe dirt on the filiment inside the sensor causing false readings. cleaning or replacing it may make the codes go away.

Posted on Nov 18, 2009

jturcotte
  • 8210 Answers

SOURCE: check engine light P0031 code,

sensor one is before the converter. Sensor 2 is after the converter. :o)

Posted on Dec 10, 2010

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I have a 2010 dodge grand caravan.replaced both 02 sensors and cat.now i have a code po138 and po404.what does that mean.


P0138 - Oxygen Sensor Circuit High Voltage (Bank 1 Sensor 2)

Fault codes never say to replace parts. They only indicate the circuit or system that needs further diagnosis. The only way to set this code is to have a break in the sensor's ground wire or the signal voltage wire is shorted to the 12 volt heater wire for that sensor. Start by looking for a corroded terminal in the sensor's connector or a terminal that got stretched or pushed out of the plug body. Next, check the wiring harness for signs of melted wires, especially where they travel near hot exhaust parts.

If you haven't found the cause by this time, use a scanner to view live data and look at the sensor's voltage compared to the passenger side sensor. If it's normal, you have an intermittent problem that isn't currently acting up. Try flexing on the wire harness to see if the voltage changes. If the voltage IS high, unplug connectors going to that sensor and wiggle harnesses until the voltage changes. That will help you narrow down the location of the problem.

Oct 17, 2016 | Dodge Grand Caravan Cars & Trucks

1 Answer

2005 jeep grand cherokee Po204 205 175 174 138 158. Runs rough. Whats wrong?


PO204,205 are injector circuit malfunction,PO174 is a system lean code, PO175 is system rich code, PO138 is heated oxygen sensor bank1 sensor 2 circuit high voltage, PO158 is heated oxygen sensor bank2 sensor 2 circuit high voltage. This is a repair for your mechanic. When they fix the injector and o2 circuits the rich lean codes will also be repaired. Continued driving will ruin your catalytic converter. Good luck

Jun 13, 2015 | 2005 Jeep Grand Cherokee

1 Answer

What is the meaning of p1653 scv motor circuit fault code on toyota rav4 1az 2001 engine


P1653 SCV Circuit Malfunction
This could be caused by the oil control valve, low oil level, infrequent oil changes, a fault in the wiring to the valve or a bad PCM. What is odd is that the code is not listed in my information database.

Mar 30, 2015 | Toyota Cars & Trucks

1 Answer

What is the meaning code p 0138?


PO138--Oxygen Sensor Circuit High Voltage (Bank 1 Sensor 2)

Next time Type: OBD PO 138 & read up

That is how you find codes

Now before you throw parts at the unknown, google &
study obd 2 systems & oxygen sensors

You will be very suprised how much there is to learn
about cars

Codes have to be diagnosed & parts component tested
BEFORE any parts get replaced

Have to find a problem first & have to test to find a failed
part,or why would you change one

The idea is to study & learn things,not take the short way out,
in hope of a quick fix,it will work a couple times with codes,
then your back here or at a shop

Jun 11, 2014 | Jeep Grand Cherokee Cars & Trucks

1 Answer

Bank 1 lower oxygen sensor - replaced with mopar sensor check engine light still on


Hi Larry:
DTC P0138 - O2 Oxygen Sensor Circuit High Voltage (Bank1, Sensor2)
The Heated Oxygen Sensor (2) located rear of catalytic converter produces an output signal relative to oxygen storage capacity of catalytic converter. Ho2S 2 signal is less active than signal produced by front oxygen sensor. This code sets when HO2 Sensor voltage is greater than 999 mV for more than 2 minutes (time depends on model. Could be as high as 4 minutes)

There may be no noticeable symptoms except for MIL illumination. Possible high fuel pressure can over rich the system.

A code P0138 may mean that one or more of the following has happened:
Faulty O2 sensor
Short to battery voltage in O2 sensor signal circuit
High fuel pressure (not as likely)

Here are some potential solutions:
Replace O2 sensor
Repair short to battery voltage in o2 sensor signal circuit

Check it; hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

Mar 01, 2012 | Dodge Stratus Cars & Trucks

1 Answer

O2 sensor code po138 is it something a handy but not car savy person replace?


P0138 - O2 Oxygen Sensor Circuit High Voltage (Bank1, Sensor2)
The Heated Oxygen Sensor (2) located rear of catalytic converter produces an output signal relative to oxygen storage capacity of catalytic converter. Ho2S 2 signal is less active than signal produced by front oxygen sensor. This code sets when HO2 Sensor voltage is greater than 999 mV for more than 2 minutes (time depends on model. Could be as high as 4 minutes)

Symptoms: There may be no noticeable symptoms except for MIL illumination. Possible high fuel pressure can over rich the system.


Causes: A code P0138 may mean that one or more of the following has happened:
  • Faulty O2 sensor
  • Short to battery voltage in O2 sensor signal circuit
  • High fuel pressure (not as likely)

Possible Solutions, here are some potential solutions:
  • Replace O2 sensor
  • Repair short to battery voltage in o2 sensor signal circuit

Hope help with this (remember comment and rates this).

Jul 22, 2010 | 2005 Chrysler Town & Country

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.

Feb 23, 2009 | 1998 Mercury Villager

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

1 Answer

Service engine light stays on.Oxygen senor& IAT sensor replaced .


Hi e_lockley. The description for that P1665 code is EVAP Vent Solenoid Control Circuit Conditions. It refers to the circuit (electrical) of the solenoid.

Do a proper diagnosis, don't just replace the solenoid because the problem may also be with the wiring and connectors leading to the solenoid. Grab a repair manual and do it yourself or ask your mechanic to verify that the part has failed before replacing it.

Good luck. You may also want to read up on another P1665 case here - http://www.obd-codes.com

Feb 12, 2009 | 2002 Chevrolet Avalanche

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