HeavenlyBang:


Except that it doesn't.

I've taken off the cats on both my Lexus ES330 and Infiniti G35 without any hit to fuel economy. I'm not just talking.

...

HeavenlyBang:


Tbh, I assumed you were referring to the cats being removed, which shouldn't affect fuel economy.

Clogged up or damaged cats may affect mpg, though.

Ah... Simple miscommunication

HeavenlyBang:


Can't hear you over the sound of this loud catless exhaust.

dead

J0hnTrevolt:
Please is it this cat here or the one under the vehicle?

The one under the oxygen sensor more likely culprit.

radautoworks:


The one under the oxygen sensor more likely culprit.

wow! I've never thought problem could be this related. Please ma any idea of the cost of this?

J0hnTrevolt:
wow! I've never thought problem could be this related. Please ma any idea of the cost of this?

Depends on what you find..

radautoworks:


Depends on what you find..

Yes ma I know. Just wanna prepare my mind as against possible cost.

TRYGO:
That's a huge money been spent son fuel consumption here.

Here's a brief.

That sensor, measures the volume of oxygen in the system, and converts that in some sort of voltage values for the ECU to use in order to attained a set air/fuel ratio balance. If the ECU sees less oxygen in the system from the O2S, it would command an increase in the injector pulse width(prolonged fuel supply):rich system.

This code tells you the ECU isn't seeing the right air/fuel ratios for it to correctly operate the car.

So replacing that sensor didn't work, because, either you got the FAKE PARTS, OR THERE'S ABSOLUTELY A SHORT OR AN OPEN CIRCUIT PROBLEM WITH THE oxygen sensor wiring harnesses to the ECU itself.

NOTE: I have had issues like this too. Only replaced that sensor with a DENSO MADE. Any other one, would trigger that code.

Asks your electrician to look at those probable causes first! At least sensor replacement has being eliminated.

Trace those wires from the sensor to the ECU. It could be that the wire from the sensor close to the exhaust manifold has chamfered, and failed.

If all the above fails, then its time to do the following:

1. There could be other things causing the fuel consumption issues, apart from the O2S.
How's your air filter quality like? Terribly dirty, or...?Have you had it replaced since you owned that car?

A clogged filter is like when one's nostrils are blocked. The volume of oxygen you inhale/exhale, becomes insufficient, and that leads to problems (heart beat increases, since it tries to supply enough oxygen to cope with the demands ).

2. Removed your spark plugs and inspect. If they are worn out, replaced them all!

3. Is/are your radiator fans connected directly with the ignition system's circuitry? Does it come on immediately the ignition is turned ON?

4. Any signs of fuel leaks on the car? Sometimes, leaks do happens, that you may not be aware of. Any petrol smell?

5. How's your cars engine temperature? Late OCI on cars would increased friction on internal engine parts, which leads to increased engine loads, and then an increased in fuel consumption.
Any problems you've observed with your accessory pulleys? Any of them sticking or making awful noises(compressor, etc).?





PS: Here's an appeal to car owners with code readers.
Having a code reader read for trouble codes, does not equate to fixing a problem by replacing parts.
Code readers are there to narrow down the likely areas where you need to troubleshoot.


Hope this gives you some succour.


Regards,
Joseph

Car was checked today by a reputable panel beater and catalyst is there and still brand new.
You are right. Maybe I got a fake oxygen sensor cos I got it from Amazon for $23

radautoworks:


Depends on what you find..

Catalytic converter was found to be intact and in good shape ma.

I'm thinking of buying a new oxygen sensor. DENSO preferably.

Does a bad 02 sensor cause high fuel consumption?

Tnx

YES

J0hnTrevolt:
Catalytic converter was found to be intact and in good shape ma.

I'm thinking of buying a new oxygen sensor. DENSO preferably.

Does a bad 02 sensor cause high fuel consumption?

Tnx

I HAVE BEEN APPEALING TO RADAUTOWORKS TO DO AN O2 SENSOR PROMO KWA

TRYGO:
That's a huge money been spent son fuel consumption here.

Here's a brief.

That sensor, measures the volume of oxygen in the system, and converts that in some sort of voltage values for the ECU to use in order to attained a set air/fuel ratio balance. If the ECU sees less oxygen in the system from the O2S, it would command an increase in the injector pulse width(prolonged fuel supply):rich system.

..


PS: Here's an appeal to car owners with code readers.
Having a code reader read for trouble codes, does not equate to fixing a problem by replacing parts.
Code readers are there to narrow down the likely areas where you need to troubleshoot.


Hope this gives you some succour.


Regards,
Joseph

This should be a sticky. I'm usually too lazy to type this.

J0hnTrevolt:
Catalytic converter was found to be intact and in good shape ma.

I'm thinking of buying a new oxygen sensor. DENSO preferably.

Does a bad 02 sensor cause high fuel consumption?

Tnx

Did the one you bought look like picture one or picture two?

Also, do you know if it's upstream or downstream? If you don't, do you know what code exactly?

radautoworks:


Did the one you bought look like picture one or picture two?

Also, do you know if it's upstream or downstream? If you don't, do you know what code exactly?

Yes ma'am. P1135 toyota avalon sensor 1 bank 1
The one I bought I bought for $23. I doubt if it's genuine.

J0hnTrevolt:
Yes ma'am. P1135 toyota avalon sensor 1 bank 1
The one I bought I bought for $23. I doubt if it's genuine.

Which one? Picture one or picture two?

radautoworks:

Which one? Picture one or picture two?

exactly as picture 2 ma.

J0hnTrevolt:
exactly as picture 2 ma.

Okay. You need to buy a better one. You bought the right type of connection but poor quality

radautoworks:


Okay. You need to buy a better one. You bought the right type of connection but poor quality

Gratitude!

J0hnTrevolt:
Gratitude!

Were you able to fix the outrageous fuel consumption?