This code came on the other day (raining). I sprayed some cleaner into the TB, with the car off and running. I cleared the code, and went for a 5 mile test drive, city/hwy (now sunny and dry). No code. Went out today (raining), 10 miles, did my shopping, no code. 1 mile out of town, CEL comes back on, same code, except, EGR circuit is not flashing on the tester. Car is 2001 LS, 80 000 miles, the only mods are K&N filter (clean no excessive oil), Taylor 8.2 wires ( a year old), and irridium plugs. Any help before I go the dealer would be appreciated.

 

That code is an o2 sensor malfunction code bank 1 sensor 1. The one before the CAT.


Save yourself some $$$ if it's running good, go to ZZP and get the o2 simulator. I've bypassed both of mine with no problems & no codes..

 

Thanks. I've read about the simulators. Unfortunately, I have a mandatory emissions check in the next few months. Doesn't the simulator just keep the CEL from coming on even though Iam "polluting"?

 

P0135: Oxygen sensor heater circuit malfunction, upstream sensor (before the catalytic convertor). Could be a fuse. You might have a loose connector or something of the such, even at the PCM. Using a digital voltmeter only, the black wire is negative (-). and the brown is the +. Should read 12v.
Checking the output will throw a code, but purple is+ and purple/white is-. . With ignition on, motor off, should read .40-.45v. Running, it should read .10 to .90v and switch actively between high and low readings. If not, trace and repair the circuit to the PCM.
Resistance on the heater wires, usually white, should be between 3-10 ohms. If open or excessive resistance, replace the oxygen sensor.
This is the basics from my Haynes manual. Good investment, $15.
Wayne
http://www.cardomain.com/ride/2319272

 

Killer ride Wayne! Thanks for the info. Test results for the output was only .2v, and did notthrow a code. I couldn't check while running as the leads on my voltmeter are too thick to get into the back of the plug. My wires were purple and tan. The resistance test (mine are blue and white + 2 black, I tested all combinations) gave 1 as a reading. Guess I'll get a new sensor and try that.

 

Changed the sensor, all seems to be normal.

Thanks guys.

FYI I live in Canada, and the dealer was the cheapest price in town. $134 versus $186!!! at NAPA.