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Po134 is o2 sensor bank 1 sensor 1
po161 another o2 sensor
p1345 crankshaft position sensor
possible cause for o2 are vehicle control module (PCM) or wiring
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You can look up the error codes on http://www.obd-codes.com. Because the error codes indicate heater circuit failure. P0135 and P0155 mean the heater circuits for the front oxygen sensors are not working properly. You need to check the fuse. #15 under the hood I think. If that is OK, make sure the exhaust system is grounded. I believe the ground strap is on the back of the cylinder head - right side.
It would be rare that both O2 sensors died again, that quickly. I suspect the dealer didn't really do any diagnostics and just replaced parts (cheap option at least for them).
Posted by Anonymous on Jan 25, 2013 why post to 2013? ELIAS? why not start your own post. and not mix, engine sensors with HVAC blower heaters. hark. the OP never once stated cars drive line. and matters 100% my guess is a jeep liberty with 3.7L and 2.4L 4 banger. the answers vary by engines. so if 161, is set the heater in bank 2 is bad, rear OXY sensor. O2 Sensor Heater Circuit (Bank 2 Sensor 2) the pcm measures the heater current flow when it reads zero the sensor is bad or the wire is cut.(or rusty)
guess 2, is that late poster thinks P0161 codes are HVAC codes no it is not. P0 codes are USA federal base codes. and are for smog not dash HVAC heaters. nice guess but dead wrong.
in most cases the 02 sensors is just bad. the heater inside it just burns open. all do that , every one... not one lasts the life of engine, ever.
here ill read it to you, the SM. for 3.7L V6 gas engine, USA book and car....
Trouble Code Conditions: ECT Sensor less than 147?F and BTS signal within 27?F of the ECT Sensor (cold engine), engine started, system voltage over 10.5v, engine running at idle speed for over 12 seconds, and the PCM detected the O2 signal was more than 3.0v for 30-90 seconds.
Possible Causes:
ASD relay output (power) circuit to the heater is open
O2 heater ground circuit is open or O2 signal circuit open
O2 heater element has high resistance, is open or shorted
The P1345 means SGC (Cam Position) sensor circuit malfunction/crankshaft position-camshaft position correlation P0300 means random/multiple cylinder misfire detected
If you do not know what the codes are, it is O2 sensor. This means the computer is not reading the right information from the faulty sensor. (there is a set range the sensor is meant to show, if one goes over or under the computer shows check engine). The diagnostic is not too bad, give the car a tune up, plugs, wires etc. and replace the O2 sensor. This normally clears up any problems. Let me know if you need further clarification or help.
Check the wire harness near the top of the engine in the rear. They were good for rubbing through on the trans fill tube bracket. Judging by the code you have 4 sensors. you would be interested in the drivers side rear sensor.
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