Kia Forum banner

1 - 4 of 4 Posts

·
Registered
Joined
·
36 Posts
Discussion Starter #1
So my 2002 Kia Optima V6 gives me a P1154.

I can clear it and it will not come back on for a long time.
Couple tanks of gas long time.

The gas mileage (MPG) does seem low.
I am thinking about replacing the O2 sensor to try and solve this.

My question is: Has anyone solved P1154 by replacing the O2 sensor or
is there some other strategy ? The car has over 140,000 miles.
I am the original owner. All maintenance is done on schedule. (By me).

I read about running injector cleaner through the system. But after so many
miles and years it would not surprise me to have to do the O2 sensor.
 

·
Registered
1999 Kia Sephia, 2016 Kia Optima SXL, 2019 Kia Soul Plus
Joined
·
1,108 Posts
So my 2002 Kia Optima V6 gives me a P1154.

I can clear it and it will not come back on for a long time.
Couple tanks of gas long time.

The gas mileage (MPG) does seem low.
I am thinking about replacing the O2 sensor to try and solve this.

My question is: Has anyone solved P1154 by replacing the O2 sensor or
is there some other strategy ? The car has over 140,000 miles.
I am the original owner. All maintenance is done on schedule. (By me).

I read about running injector cleaner through the system. But after so many
miles and years it would not surprise me to have to do the O2 sensor.
P1154 HO2S Circuit-Transition Switch Time Malfunction / Slope(Bank 2 / Sensor 1)

You can try the O2 sensor, but I would make sure the wiring isn't damaged or clamped. It needs a supply of ambient air which is supplied through the wiring so damage could give it a false code.
 

·
Registered
Joined
·
36 Posts
Discussion Starter #3
Going to do O2 for P1145

I checked for an ambient air sensor and according to local
auto parts store computer system I do not have one on the 2002 V6.

I do have a pressure sensor on the intake and checked it for being clean.

I wish sensors had some sort of test that could be done with a meter.

P1154 says Bank 2 / Sensor 1 .

Bank 2 appears to be the one nearest the radiator and sensor 1 appears
to be the upper one in the exhaust manifold.

The sensor is $33 from local store. Direct bolt on.

The center of the top of exhaust manifold looks like a very small hairline crack. This could also cause the P1154 so I will have to investigate further.

One thing I noticed and am disappointed in is the quality of rubber and plastic the wiring harness cover is brittle and simply disintegrating.
The rubber lines also seem to be falling apart.

I have never seen such poor quality on a car this old.

But the brittle outer wiring casing made it easy to trace the O2 sensor
wires and look for faults, crimps, problems. There did not appear to be any.

Still looking to hear from anyone having P1154 problem and what they have done so far.
 

·
Registered
Joined
·
36 Posts
Discussion Starter #4
Follow up:

I did replace the O2 sensor that is nearest the radiator.
Very easy to do. Not too expensive, under $40 USD.
This is bank 1 upstream I think. They tell me this car has 4 sensors ??

And while I was in there had to replace the intake hoses that are rubber between the air cleaner box and MAF, and the MAF and intake manifold.
The one that had split was the one between MAF and intake, but I did both anyway.

Also replaced the dealer supplied fuel supply line under the hood and made
my own return line. Both were rotted pretty bad.

Just some FYI in case you all are under the hood.
 
1 - 4 of 4 Posts
Top