got ck eng lite and scannned p1135 bank 1 sensor 1 and changed the 02 sensor on the manifold. Ck lite will not reset. Is it the sensor on the inboard manifold prior to the cat? Do I reset with scan tool or disconnect battery terminal?
The code you're receiving indicates a problem with the HEATER CIRCUIT for BANK 1 SENSOR 1, which on the V6 is located firewall side of the exhaust manifold.
The problem could be the relay, wiring or sensor. On the O2 sensor (A/F sensor in Toyota speak) measure the resistance between the RED/WHITE (B+) and BLACK/RED (HT) terminals. Sensor cold should read 0.8 to 1.4 ohms, and hot should read 1.8 to 3.2 ohms. (4 cylinder 1.8 to 3.4 ohms, 5.0 to 7.5 ohms)
If you don't get those readings (yours will likely be open if bad) and only THEN should you replace this $$ sensor (with an OEM Toyota part). Otherwise, check the easy and cheap to replace relay, and the wiring.
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A few months ago the check ENGINE LIGHT and VSC light came on in my wife's 2002 Highlander. The problem was diagnosed correctly by batauto member Jim as a loose vacuum hose(just below the air filter housing). I simply reattached the hose, my wife drove the vehicle a couple of weeks (she nagged me like hell) but fortunately the computer re-set and the lights have not been on since.