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Replaced both O2s sensors on rear. And the light still comes on, what else could it be?

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As in the check engine or SES light. The code might need to be cleared from the computer, you can disconnect the negative battery cable for bout 10 minutes or so, it should clear the stored memory in the computer. If it still comes on, you might have another problem.

Posted on Mar 15, 2011

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Posted on Jan 02, 2017

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1 Answer

How do i fix a code p0134 for my 1999 infintiy i30


code p 0134 refers to heated oxygen sensor(HO2S) 1 bank 1--no activity detected ===causes wiring open circuit ---heating inoperative ---HO2S Sensor
also refers to oxygen sensor (O2S) --no activity detected ===causes --- wiring---O2S
the HO2S is in the exhaust manifold before the cat converter
the O2S is after the cat converter
check the wires and connections , then replace either or both sensors

Oct 22, 2016 | Cars & Trucks

1 Answer

Po136-o137 says change 02 sensor on bank 1 sensor2 I did but engine light is still on 2004 chevy tahoe


code p 0136 refers to heated oxygen sensor (HO2S) 2 bank 1 ---circuit malfunction===causes ---heating inoperative ---wiring---HO2S--- ECM
also refers to oxygen sensor (O2S0 2 bank 1---circuit malfunction===causes --- wiring---O2S ---ecm
it also refers to heated oxygen sensor (HO2S) 2 bank 1 ---no signal===causes ---wiring --- HO2S---
code p 0137 refers to HO2S 2 bank 1 ---low voltage -===causes --exhaust leak---wiring short to ground ---HO2S--- ECM
it also refers to O2S 2 bank 1---low voltage ===causes exhaust leak---wiring short to ground ---O2S ---ECM
to set you up here-- there are 4 oxygen sensors in the system
2 are heated oxygen sensors (HO2S) on in each exhaust manifold or exhaust pipe before the cat converter and
2 oxygen sensors (O2S) -- one in each exhaust pipe after the cat converters
heated oxygen sensors have 4 wires and O2S sensors normally only 2 wires
it is more that possible that you changed the wrong sensors and in the process damaged the delicate wires with the incorrect spanner being used

Jul 25, 2016 | 2004 Chevrolet Tahoe

1 Answer

Will not start p2045 p2197 p0190 p2247 p2245 p2248 p2249 p2518 comes up


code p2045 refers to reductant temperature sensor--high input==causes --wiring faulty sensor
code p2197 refers to heated oxygen sensor(HO2S)1 bank 2-- signal stuck lean===causes HO2S---fuel pressure---injectors---intake leak
also refers to oxygen sensor (O2s)1 bank 2 -signal stuck lean===causes--O2S--fuel pressure---injectors---intake leak
also refers to heated oxygen sensor (HO2S) 1 bank 2--implausible signal===causes wiring---short to ground--short to positive--HO2S---ECM
code po190 refers to fuel rail pressure (FRP) sensor-circuit malfunction===causes --wiring ---fuel rail pressure sensor---ECM
code p2247 refers to heated oxygen sensor (HO2s) 1 bank 1 reference voltage--open circuit===causes--wiring ---ho2s
also refers to o2s 1 bank 2 reference voltage ---open circuit===causes wiring---o2s
also refers to HO2S 1 bank 2 ---no signal===causes wiring--ho2s---ECM
code p2245 refers to HO2S 1 bank 1 --reference voltage --circuit low===causes--wiring short to ground--ho2s also refers to o2s 1 bank 1 circuit low===causes wiring short to ground--o2s
code p2248 refers to the ho2s I bank --performance problem===causes --wiring--ho2s
code p2249 has the same causes short to ground---ho2s and o2s
code p2518 refers to a/c refrigerant pressure sensor B ---circuit high===causes wiring short to positive--a/c refrigerant pressure sensor.
so after all that replace all the ho2s and o2s sensors using the correct tools so that the wiring is not damaged and check the wiring back to the ECM for burns and rub marks.

Dec 30, 2013 | Cars & Trucks

1 Answer

Where is the rear "b2 s2" oxygen sensor located in a Jaguar 2003 xtype 2.5liter car? There are 4 oxygen sensors -- one in the front catalytic converter and one next to it by or in the exhaust manifold and...


Oxygen sensors are always numbered like this:
Bank 1 sensor 1
Bank 2 sensor 1
Bank 1 sensor 2
Bank 2 sensor 2

Some manufacturers use a kind of shorthand that reads different, but means the same thing:
Sensor 1/1 or O2s 1/1
Sensor 2/1 or O2s 2/1
Sensor 1/2 or O2s 1/2
Sensor 2/2 or O2s 2/2

Bank 1 is always the side of the engine where cylinder number 1 is located and, of coarse, Bank 2 is the opposite side.
On a 4 cylinder engine, there is only 1 bank and it is always referred to as Bank 1.

Sensor 1 is always the upstream sensor (The one located BEFORE the catalytic converter)
Sensor 2 is always the downstream sensor (the one that is located AFTER the catalytic converter.

Hope helps (remember to rate this).

Oct 06, 2010 | 2002 Jaguar X-Type

1 Answer

Is there any way to clean oxygen sensors to make em last longer? 1998 isuzu amigo 2.2l 5spd check engine light is on 5 codes come up on obd 2 reader: p0134 po135 po342 p0134pd p0135pd what do they mean ? i...


if the wires are not damaged , washing them in vinegar to remove the exhaust build up on the sensor tip sometimes helps
code p 0134 refers to heated oxygen sensor (HO2S) 1 bank 1 --no activity detected ===causes--- wiring open circuit ---heating inoperative ---HO2S
it also refers to oxygen sensor (O2S)--no activity detected ====causes --wiring ---O2S
code p 0135 refers to HO2S 1 bank 1--heater control -circuit malfunction===causes ---fuse ,wiring ---HO2S---ECM
code p 0342 refers to camshaft position (CMP) sensor A , bank 1---low input ===causes ---wiring short to ground -- CMP sensor ---ECM

oxygen sensors have delicate wiring in the harness so they are easily damaged when the correct sensor tool is not used in the installation or removal process or the wires are pulled when disconnection the connection plugs

Jul 15, 2017 | 1998 Isuzu Amigo

1 Answer

The engine malfunciton light is on that looks like a motor. Went to autozone for free test code P0420. said could be oxygen sensor, ignition system or couple other things. put in some stp for now. dont...


po420 is catalylic converter system efficiency below threshold, which means converter is not burning or cleaning exhaust good, i ve found that 90% of the time its bad o2 sensors they give off a false reading to computer, replace the frt and rear o2 sensors and reset engine light that should take care of problem, if cat con verter happens to be no good its no loss because new o2s should be replaced with new converter, but i think o2s will solve youe problem. hope this helps.goodluck.

Dec 13, 2009 | 2002 Honda Civic

1 Answer

Nissan fronteir codes are P0420, P0430 what has failed


po420 and430 is telling that the catalyst converters are no good both, most of the time bad o2 sensors maake computer think cat is no good, the way it tests is if o2 sensor reading before cat is about the same as the one after cat computer asumes cat is not bruning exhaust good , iwould replace o2 sensors reset check engine light and go from there, that might be the problem,if you were to replace cat o2s should be done at that time,so do o2s first,good luck.

Nov 05, 2009 | 2003 Nissan Frontier Crew Cab

1 Answer

How do you replace the oxygen sensors in a 2001 nissan altima?


REMOVAL & INSTALLATION
  1. Start the engine and allow it to reach normal operating temperature, then turn the ignition switch OFF.
  2. Disconnect the negative battery cable.
  3. Open the hood and locate the Oxygen (O2S) sensor connector. It may be necessary to raise and safely support the vehicle for access to the sensor and its connector. NOTE: On a few models, it may be necessary to remove the passenger seat and lift the carpeting in order to access the connector for a downstream O2S sensor.
  4. Disengage the O2S sensor pigtail connector from the vehicle harness connector. NOTE: There are generally 2 methods used to mount an O2S sensor in the exhaust system: either the O2S sensor is threaded directly into the exhaust component (screw-in type) or the O2S sensor is retained by a flange and 2 nuts or bolts (flange type). WARNING
    To prevent damaging a screw-in type O2S sensor, if excessive force is needed to remove the sensor lubricate it with penetrating oil prior to removal. Also, be sure to protect the tip of the sensor. O2S sensor tips are very sensitive and may be easily damaged if allowed to strike or come in contact with other objects.
  5. Remove the sensor, as follows:
    • Screw-in type sensors — O2S sensors are usually designed with a permanently attached wiring pigtail. This allows the wiring harness and sensor connectors to be positioned away from the hot exhaust system. It may be necessary to use a socket or wrench that is designed specifically for this purpose. Before purchasing such a socket, be sure that you can't save some money by using a box end wrench for sensor removal.
    • Flange type sensors — Loosen the hold-down nuts or bolts and pull the sensor out of the exhaust component. Be sure to remove and discard the old sensor gasket, if equipped. You will need a new gasket for installation.
  6. Perform a visual inspection of the sensor. Black sooty deposits may indicate a rich air/fuel mixture, brown deposits may indicate an oil consumption problem, and white gritty deposits may indicate an internal coolant leak. All of these conditions can destroy a new sensor if not corrected before installation. To install:
  7. Install the sensor, as follows: NOTE: A special anti-seize compound is used on most screw-in type O2S sensor threads, and is designed to ease O2S sensor removal. New sensors usually have the compound already applied to the threads. However, if installing the old O2S sensor or the new sensor did not come with compound, apply a thin coating of electrically-conductive anti-seize compound to the sensor threads. WARNING
    Be sure to prevent any of the anti-seize compound from coming in contact with the O2S sensor tip. Also, take precautions to protect the sensor tip from physical damage during installation.
    • Screw-in type sensors — Install the sensor in the mounting boss, then tighten it securely.
    • Flange type sensors — Position a new sensor gasket on the exhaust component and insert the sensor. Tighten the hold-down fasteners securely and evenly.
  8. Reattach the sensor pigtail connector to the vehicle harness connector.
  9. Lower the vehicle.
  10. Connect the negative battery cable.
  11. Start the engine and ensure no Diagnostic Trouble Codes (DTC's) are set.

Fig. 1: Since sensor locations vary between vehicles, the first step in removal is to locate the O2S sensors (arrows)...

bb4d603.jpg
    Fig. 2: ... and the sensor connector (2), which is usually near the O2S sensor (1), but removed enough from the heat of the exhaust system
    5048c2d.jpg
    Fig. 3: Disengage the sensor pigtail connector half from the vehicle harness connector half
    a1433b0.jpg

Oct 01, 2009 | 2001 Nissan Altima

1 Answer

2001 Nissan Maxima service engine light stays on code from Auto Zone scanner is PO139 and PO138. What should my next step be to solve this problem.


code p 0138 refers to 2 items
1--heated oxygen sensor(HO2S) 2 bank 1--high voltage ==causes --wiring short to positive --HO2S---ECM
2--oxygen sensor (O2S) 2 bank 1--high voltage ===causes wiring short to positive ---ECM
code p 0139 refers to 2 items
1--- heated oxygen sensor (HO2S) 2 bank 1--slow response ===causes --heating inoperative --wiring--ECM
2--oxygen sensor (o2S) 2 bank 1 slow response ===causes --wiring --- O2S

heated oxygen sensors9HO2S) are in the exhaust manifold before the cat converter
Oxygen sensors (O2S) are after the cat converter
it is indicated that the HO2S is faulty-
check the wiring and /or replace both sensors

Nov 16, 2017 | 2001 Nissan Maxima

2 Answers

A trac off light is on the dashboard


P0130--O2s sensor circuit 1
P0134--O2s circuit insuffient Act sensor 1
P0135--H02s heater performance sensor 1

Jun 03, 2008 | 2002 Chevrolet Cavalier Coupe

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