Question about Cars & Trucks
Honda crv 2000 Real time awd have a white smoke on my tailpipe and a check engine with obd Code P0138. Replace the Engine head cover gasket due to some leak in the side of the cover then we replace the O2 sensor after the cat converter. And erase the code and the check engine light was gone but for an hour or two only Again we scan the check engine obd code reads P0138 and P0136 so we replace again the o2 sensor before the cat converter(as per advise of a car repair shop) we erase the codes again and it came back again after an hour. a little White smoke is still flowing out of my tailpipe while I'm on a stop while running none. what came we do to solve the problem. please Help.
Posted by Anonymous on
That code does not say the sensor is bad. It says the circuit for the sensor is not right. It is bank 1, sensor 2. The code may be set because the sensor ground wire has a break, or the sensor's signal voltage wire is shorted to the 12 volt heater wire for that sensor. Look for corroded terminals or stretched pins at connectors. Check the harness wires for signs of melted wires, like where they run near hot exhaust parts.
Posted on Mar 30, 2017
When the engine is cold place a piece of paper in front of exhaust pipe and see if that white smoke contains oil in it.
If it is oil it means a cracked block or worn rings in engine which means very expensive repair or replacement of engine.
If steam is coming out exhaust then water is escaping from the head gasket into the fuel chamber of the piston and is being ignited and turned into steam. A blown head gasket or worse a warped engine head may be the cause. A engine compression test would rule this out as a cause .
Posted on Mar 30, 2017
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Posted on Jan 02, 2017
SOURCE: code # P0141 and P0138
You said you changed the O2 sensors, which ones? I do believe that sensor 2 is the Catalyst efficiency monitor, it looks like an O2 but it's function is different. This sensor is behind the Catalytic converter, the O2 is in front. Bank one is the bank that # 1 cylinder is on, so the sensor that is defective is the 2nd sensor back on that sides exhaust pipe.
P0141 - Heated Oxygen Sensor (HO2S) Heater Performance Bank 1 Sensor 2
P0138 - Heated Oxygen Sensor (HO2S) Circuit High Voltage Bank 1 Sensor 2
Posted on Nov 15, 2008
sorry but in this case the dealer is correct,ONLY oe cats will solve this problem, have worked on dozens of the cars no aftermarket cat i've seen has worked. you can chase this problem all over but it will still go back to the cats ,sorry no better answer
Posted on May 21, 2009
It is probably the sensor before the cat. if it has a heater. The heater circuit going bad is a common problem, it does not affect the way the car runs after it warms up, it is an emission device to heat the O2 sensor up quicker than the hot exhaust gas would. It should be replaced because it will keep your check engine light on and you would not be able to pass an emission test.
Posted on Oct 12, 2009
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