[QUOTE=toyomoho;69694]The confusion exists in that a 4 cylinder has only one bank (cylinder head) while the V6 has two.

The rear cylinder head on the V6 is Bank 1. The only cylinder head on the 4 cylinder is also Bank 1.

For a 4 cylinder look on the side of the engine facing the radiator for the exhaust manifold. Follow the manifold from the head to the first sensor. This sensor will be mounted on a section of the manifold after all the individual exhaust pipes combine.

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True.. I just assumed it was still bank 1 in the back
Yes, it's there plain as day... right out in the open with wires leading to a harness. So i read that each sensor (3 of them) on the camry has it's own code and mine came up P1135 which the autoparts store says was proprietary to Toyota. The scanner stated the area but not the actual issus. Toyota is telling me that code has to do with the air fuel ratio sensor and they need to run tests ($90) to determine exactly what the issue is the cost of which goes to replacement of the affected sensor.... approx $400 total. The sensors cost approx 100 bucks. thanks for the quick reply. .much appreciated.

 

This code number is common, AF/02 sensors do fail and it is typically the first sensor on the exhaust system that fails.

The code number is very specific as to which sensor, Bank 1 Sensor 1.

Typically the issue is:
Failed sensor.
Issue with the sensor heater or wiring to sensor.
Engine computer (see below).

Does the dealer think there is an issue with the wiring to the sensor?

Has the dealer looked at the car?

Sometimes the year/model/engine type of car has a design issue. It has happened the engine computer causes a code when there is no problem. Typically the manufacturer finds this out and issues a service bulletin so dealer knows this. Assume this is not the case here.

As to the part. Typically aftermarket sensors are available and prices can be lower then the dealer.

For various reasons NOT ALL aftermarket manufacturer brands and designs of sensors work well OK in Toyota. The recommended sensors for Toyota are Denso and Toyota brands. Denso typically always works fine.

Most likely you could find the right aftermarket sensor but in looking at sensor prices for this car the Toyota price is in the ball park, thus why bother.

If Toyota wants $400 + $90 = $490. You can buy the Toyota brand sensor for $100 and replace it yourself. The internet is full of hits on how to replace these sensors.

You could replace all 3 sensors yourself for less then Toyota wants, but don't recommend this.

The last sensor on the exhaust system seldom fails and again the code is very specific as to location of the problem sensor.

If you purchased the part from 1sttoyota.com, a discount Toyota parts dealer, you might save an additional 20%. If going this route identify yourself as an internet customer if calling them.

Unless missing something here don't understand the need to spend this kind of money on what is typically a simple repair or swapping a bad part for a good one.

You might read up on this code and 02/AF sensor on the internet. Type in P1135 and Toyota. The code and what is means is pretty standard for all Toyota. The actual sensor part number will vary with the model/year/engine/etc.

 

The resistance for a non-California sensor may be 11-16 ohm at room temp. so what about emision set up?

 

I had an 1135 and 1155 at the same time. It wasn't the sensor. Someone had neglected to reconnect the EB (or EC) ground wire. It attaches to the back of the intake plenum and is annoying to reconnect. The ground may have also be redirected poorly. There are lots of sources for the pinouts on the ECM connection board. Check continuity from the grounds going from the A/F ground to a chassis ground. It should be less than half a mOhm. Someone did a really good write up on the forum here. search for it.