–Had Check Engine light on for a couple days and code reader said P0135. Parts guy said this means “Bank 1”, my Haynes book calls this code for " Primary Sensor 1" Is this the same as “Upstream”?
–Replaced O2 sensor (Denso 192400-1160 05F12) myself with a new one (Bosch 15710). Fit perfectly, plugged right in.
–Check engine light goes off for about 5 minutes but comes back on with code P0134.
What should I do now? I replaced the sensor closer to the engine before the catalytic converter. Very easy to reach from the top. I rented the correct tools and did not damage or force anything. Is there a second O2 sensor after the cat that is not so easy to reach? Was that the one I needed to replace? Did I misunderstand the meaning of “upstream” or “Bank 1”?
The sensor you replaced provides the signal to the ECU for proper fuel metering. There is a second one after (“downstream from”) the cat converter that monitors the performance of the converter and trips the code you’re seeing of it detects poor catalyst performance.
“Bank one” is basically the only one you have, since Civics only have inline 4 cylinders. “Bank 2” is used for systems that have V6 engine, like those available on the Accords.
You either need to replace the downstream sensor or replace the catalytic converter. I’d try the sensor first, clear the code, and see if it reoccurs. If not, you’ve won the bet. If it does, you’ve lost nothing, as you’d want to replace the downstream sensor when you changed the converter anyway.
P0134, A/F sensor (upstream) no activity. Unplug the connector and inspect for loose pins/connectors.
Either a air/fuel ratio sensor is used or a oxygen sensor depending on which engine your car has. You may have install the wrong part for the application.
Damn, damn, damn. Now I have to pull my foot out of my mouth yet again. I thought my memory was better than that. I KNEW I should look up the code before posting.
Thanks for the correction, Nevada. Someday…maybe…if I live long enough…I’ll learn not to trust my memory.
Thanks for your help everyone. I am hoping it is a defective sensor. The pins are well-protected by the wiring harness plug and I don’t think they could be bent, but I’ll take a look. I did coat them with dielectric grease beforehand.
What are the chances that the wiring harness itself is bad? I am guessing not by the fact that the new sensor worked for about 5 minutes/2 miles.
Anyway, Circuitsmith was right–I did need another Denso sensor. I tried 2 identical Bosch ones, each lasted about 2 minutes before setting code P0134.
Bosch website, Pep Boys website, and Pep Boys internal database all recommend the Bosch for this vehicle! How is this not fraud?!? Luckily they did allow me to exchange the bad ones.
Problem solved! Thanks CarTalk Guys esp. Circuitsmith!