OBD codes

[DeanjayZ]

Hi folks, I need some advice on OBD error codes, and live readings. If a techie can help here? I seems to be having heavy fuel use, prompting me to acquire an OBD scanner to see what’s wrong.

I’ve been constantly getting a P0150 and P0173 code. This comes down to a faulty 02 sensor - sensor 1 bank 2?

 

[Pingu]

I'm no expert, but I don't think the sensors are faulty, as they are both showing a voltage.

Your coolant temperature seems to be very high. I'd expect something in the high 70s, 80s, or low 90s.

Have a read of this...

Reading O2 sensor voltage ranges in Live Data

The voltage output of an oxygen (O2) sensor in a properly functioning vehicle can vary depending on the specific engine and the operating conditions.

www.innova.com

It would be my first port of call. A quick read would suggest that you have a rich mixture on bank 1.

 

[DeanjayZ]

I'm no expert, but I don't think the sensors are faulty, as they are both showing a voltage.

Your coolant temperature seems to be very high. I'd expect something in the high 70s, 80s, or low 90s.

Have a read of this...

Reading O2 sensor voltage ranges in Live Data

The voltage output of an oxygen (O2) sensor in a properly functioning vehicle can vary depending on the specific engine and the operating conditions.

www.innova.com

It would be my first port of call. A quick read would suggest that you have a rich mixture on bank 1.

 

[DeanjayZ]

Hi buddy, thanks for your reply. It really seems to be gulping fuel at the moment!

 

[Pingu]

Hi buddy, thanks for your reply. It really seems to be gulping fuel at the moment!

Yes this would agree with running rich.

A lean mixture is usually due to an air leak after the MAF, a rich mixture is much harder (and usually more expensive to fix). It's normally down to something that affects the fuel trim. That will usually be a sensor. I'd start with your coolant sensor. Is the coolant really at 102°C?

 

[Pingu]

Yes this would agree with running rich.

A lean mixture is usually due to an air leak after the MAF, a rich mixture is much harder (and usually more expensive to fix). It's normally down to something that affects the fuel trim. That will usually be a sensor. I'd start with your coolant sensor. Is the coolant really at 102°C?

Seven Things That Make Your Air and Fuel Mixture Too Rich

Ideal Automotive in Blaine, MN, shares the seven things that make your air and fuel mixture in your car too rich.

idealautomotivemn.com

 

[colb]

Air leaks into the vacuum system across the engine is the usual cause for high fuel trims as the others have already suggested. Check over all the rubber intake bellows from Maf to throttle body for splits or holes. Give the remaining hoses and pipes a good visual check for holes or splits, renew any that are found. Also check cam cover gasket and O ring in the dipstick tube. Often missed are rubber blanking caps that split and fall off the underside rear of the inlet manifold, feel and look under the rear of the manifold for these. A smoke test will find any leaks that you can't find visually.
Check all this out before condemning the exhaust sensors they can be upset by faults upstream of their location, hence the vacuum checks being required.

 

[IanA]

Air leaks into the vacuum system across the engine is the usual cause for high fuel trims as the others have already suggested.

+1 from me, especially as the idle speed is high at 1234rpm. I'd expect 7-800.

Also- regularly clear all codes so that you are only reading the persistent ones. Transients can build up over time and cloud the situation.