.:HSTuners::

09-21-2003, 07:02 PM

Maybe others have had this problem: 96 Civic EX. Check engine light goes on. Car has 98,000 mi on it. I figured it had to be the O2 sensor. I replaced the 02 sensor in about 5 min, started it back up, the CEL was off, drove it home. The next morning the CEL was back on. I hooked up the scanner and it's throwing up a P0135 code, which is a o2 sensor heater circuit malfunction. So thinking that it might be a faulty O2 sensor, I replaced it with a new one, and the CEL was still on. I got a wiring digram, located the wires for the O2 sensor heater. I tested them on the engine side of the O2 sensor, and was getting a signal. Tested them at the ECU and got a signal. Finally, I tested them at the junction relay on the drivers side of the engine compartment, and got a signal there too. The CEL is still on and I am out of things to check. If anyone knows anything please let me know.

*pdiggitydogg* · 09-21-2003, 08:57 PM

did ya check the 2ndary o2?

09-22-2003, 07:56 AM

The P0135 code is only for the primary O2 sensor. Thanks anyway.

ebpda9 · 09-22-2003, 08:07 AM

well did u reset the ecu ? i know on mine the cel is gonna be on until reset

09-22-2003, 09:15 AM

Yes, I reset the ECU and the CEL is still on

09-22-2003, 03:55 PM

OK...I've found the answer to my problem. (sort of)

I talked to the head service tech at the local Honda dealer. He told me that all 96-97 Hondas have a mandatory federal emissions system warranty to 150,000 miles. He wants me to bring the car there so they can hook up a honda scanner and see if the same code comes up. Anyway, It'll be fixed for free.
I'll let everyone know what the dealer says when I get the car in.

09-21-2003, 07:02 PM	#1
96 Jdm EK Posts: n/a	Help Maybe others have had this problem: 96 Civic EX. Check engine light goes on. Car has 98,000 mi on it. I figured it had to be the O2 sensor. I replaced the 02 sensor in about 5 min, started it back up, the CEL was off, drove it home. The next morning the CEL was back on. I hooked up the scanner and it's throwing up a P0135 code, which is a o2 sensor heater circuit malfunction. So thinking that it might be a faulty O2 sensor, I replaced it with a new one, and the CEL was still on. I got a wiring digram, located the wires for the O2 sensor heater. I tested them on the engine side of the O2 sensor, and was getting a signal. Tested them at the ECU and got a signal. Finally, I tested them at the junction relay on the drivers side of the engine compartment, and got a signal there too. The CEL is still on and I am out of things to check. If anyone knows anything please let me know.

09-22-2003, 08:07 AM	#4
ebpda9 Repost Wagon Join Date: Dec 2001 Location: over here Age: 43 Posts: 17,266	well did u reset the ecu ? i know on mine the cel is gonna be on until reset __________________

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09-21-2003, 08:57 PM	#2
pdiggitydogg Yahoo Watashi wa kattaze! Join Date: May 2002 Location: Meanwhile, up in The D... Age: 40 Posts: 10,579	did ya check the 2ndary o2?

09-22-2003, 07:56 AM	#3
96 Jdm EK Posts: n/a	The P0135 code is only for the primary O2 sensor. Thanks anyway.

09-22-2003, 09:15 AM	#5
96 Jdm EK Posts: n/a	Yes, I reset the ECU and the CEL is still on

09-22-2003, 03:55 PM	#6
96 Jdm EK Posts: n/a	OK...I've found the answer to my problem. (sort of) I talked to the head service tech at the local Honda dealer. He told me that all 96-97 Hondas have a mandatory federal emissions system warranty to 150,000 miles. He wants me to bring the car there so they can hook up a honda scanner and see if the same code comes up. Anyway, It'll be fixed for free. I'll let everyone know what the dealer says when I get the car in.