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Dear Experienced users and engineers in the house. Pls kindly help, after scanning my car, Toyota Camry 2003, 4 plug. last month, I got an error code P1130. I was told by my panel beater is the O2 sensor. I changed the O2 to a new one. After fixing the O2 sensor, I cleared the code without scanning, cos my scanner allows clearing of codes before scan action, but to my surprised the code returned almost immediately. I drove for a while and l repeated it but still the same. This next try, I had to scan and read the code, to my surprised it is not longer P1150, it is now P1135, this time it is referring to the 02 sensor.

Pls guys, which of these two codes is for 02 sensor?

Is one referring to bad O2 sensor or weak 02 sensor?

Pls note, my car does not have manifold catalyst I for months I have been driving it and there was no error code?

This case is a bit complex.
First, the fact that you have been driving the car for months without manifold catalytic converter may not mean the code was not there then, unless you are telling us there was no check engine light at all on your dash all those period. This is because if your car systems work well and your manifold catalytic converter is missing, the downstream O2 must flag this with P0420 code (or unless you have a O2 spacer installed to hide the issue).

Also, let me ask if you are sure the reoccurred codes are under New codes or Confirmed codes and not under Permanent codes. Some cars (though I think from around 2008 model) are program to transfered cleared code to permanent codes and can only clear itself after travelling around 200 miles having resolved the issue that caused the code to set.

Now back to the code P1130 & P1135. These codes looks more of a circuit wiring or connection issue than a mechanical one on the O2 sensor on the exhaust manifold (just before the manifold catalytic converter).
- Please check the wiring harness on the engine side. There may be a short, or disconnection.
- Inspect the wires immediately behind the harness. They may be wrinkled and cut internally.
- You or your rewire may need to carry out some continuity test with digital multimeter just to be sure the engine side wirings are fine.

I also suspect the new O2 sensor you got is a tokunbo not brand new. If yes, it may also be weak and performing like your condemned one. The ECU sets those codes when the O2 is not working at all or when it is working but the report being fed to the ECU is outside the programmed specifications.

Finally, both codes are related to O2 sensor 1 but I feel the issue is around the circuit wiring.

All the best.

This case is a bit complex.
First, the fact that you have been driving the car for months without manifold catalytic converter may not mean the code was not there then, unless you are telling us there was no check engine light at all on your dash all those period. This is because if your car systems work well and your manifold catalytic converter is missing, the downstream O2 must flag this with P0420 code (or unless you have a O2 spacer installed to hide the issue).

Yes very complex to troubleshoot,

Although I have been driving the car for months but didn't notice the P0420 code, because it was scanned and codes that shown up only pointed to misfires plugs and not even about catalyst or O2 sensors.

I started seeing all these 02 sensors codes (recently after one mechanic help me the top gasket in the car.

Kindly note that uptill today, even as there is Catalyst, the scan machine only report P1150, ithat now changed to P1135 after I changed the O2 sensor to a Tokunbo version.

I don't know if there is O2 sensor spacer or not because I don't know how they look or feel on the O2 sensor itself.

For a quick one, I tried to ask questions about the manifold catalyst and I was told there are 3 types in the market namely; Tokunbo, New one and Worked One. Also I want to be enlightened about their differences.

Thanks for your contribution

O2 spacer is used to fix P0420 code (catalytic converter inefficient), though it only hide the issue and not fix it. You can Google it up.

On the 3 types of catalytic converter. What I know is that the new ones are mostly china made which are somehow inferior. I read they last for roughly 2 yrs. The tokunbo and work ones are somehow same. Work ones are cut off from tokunbo so that they can be sold separately to those who cannot afford complete tokunbo exhaust with catalytic converter.

Maybe we should keep the catalytic converter issue aside since you said none of the codes obtained are related to catalyst.

It is possible that while replacing your engine top gasket, the mechanic mishandled/rough-handled the O2 sensor wiring harness. So I still suggest you inspect the harness carefully as I described in my previous post.

Thank you very much @kaziem. I am currently with my technician trying to inspect the wiring of the O2 sensor.

I will update this topic whichever way it goes.