Greetings,

I have conducted extensive research regarding this matter and am seeking insights from your expertise.

I own a 2003 Honda Accord Type S with an i4 engine. Despite the OBD readings indicating reasonable fuel consumption, I've noticed an apparent fuel consumption issue. I will provide attached photos subsequent to this post. Lately, I've been facing notably high fuel consumption despite my attempts to resolve the problem. I've already replaced the spark plugs and serviced all serviceable components.

The persistent error code that initially came with the car, which pertains to the O2 sensor bank 1 sensor 2 heater circuit, continues to be the outcome of my scans.

Additional note: The car was initially purchased without a catalytic converter. I possess real-time data from three separate trips, encompassing fuel consumption and other related metrics.

When driving, the downstream O2 sensor exhibits a reading of 1.48v. Notably, the short-term and long-term fuel trims consistently display no readings. Both cooling fans are functioning directly. I've contemplated the acquisition of a functional upstream O2 sensor with the intention that it might alleviate fuel consumption, given that the upstream sensor is completely detached from its port.

I find myself in a state of confusion. I'm hesitant to make the purchase if it ultimately proves ineffective. Your insights on this matter would be greatly appreciated.

I will provide any data required from my data recording upon request.

modified: My panel beater said i had a leak at the front of the exhaust and it has been fixed.

First trip after exhaust leak was fixed.

Second trip.

 

You have no fuel trims because the PCM never gets to closed loop. Fix the heater circuit.

 

Can I just fix the upstream??

 

The heater circuit is the problem. Start with the fuse. Good?

 

A cold engine starts and runs in open loop. During this time, the ECU uses a map of how much fuel to use to keep the engine running.
When the engine warms up (under normal circumstances), the engine will go into closed loop.
At this time, the ECU will change from using closed loop data to open loop data from the O2 bank 1 sensor 1.
Up stream O2 sensor is the air fuel ratio sensor. The ECU uses the data from the sensor to determine how much fuel to use
It does this by changing the pulse width modulation of the injector pulse. Changes the time the injectors are firing fuel into the cylinders.
If there is a DTC then it could prevent the engine from going into closed loop. Depends upon the DTC.
Short and long fuel trims need the upstream O2 sensor to be working and the system to go into closed loop.

My advice is to fix all the O2 sensors and or associated wiring. ie, heater circuits.

 

Thank you to everyone. But does running on an open loop cause a significant change in fuel consumption, i use an app called infoCar and my average mileage so far has been 10.L/100km

 

Why ask for help and do nothing?
I'm done here.