02 sensor bypass

[07GTS]

u may only have to change 1 or 2 sensors, the fronts are needed and the rears keep an eye on them, if fronts are bad then the rears show a fault or the fronts are good and the rears are at fault

 

[Commo64]

Have put a scan tool on it and that's the error I get and trying to not spend heaps of money as the ve has 4 sensors 2 pre cat 2 post cat and I have been quoted lowest 400 bucks trying to save a bit of coin that's all

Fair enough, but as @Immortality said, it might need a tune for it to run without the O2 sensor... You could drive with it broken but I wouldn't do this for the long term as the car isn't running on the correct fuel mixture...

 

[greenacc]

So which one did the scanner say was faulty? You don't get all 4 suddenly die on the same day.

 

[Pollushon]

O2 sensors are a symptom more often than a cause. If all sensors or two on a bank error, it's likely something else. They're also one sensor you want to have. They prevent pure fuel pouring out the exhaust and/or your engine leaning into a forge weld when you fang it

 

[losh1971]

A play with the tune will be double the price of all four sensors.

 

[Fu Manchu]

Have put a scan tool on it and that's the error I get and trying to not spend heaps of money as the ve has 4 sensors 2 pre cat 2 post cat and I have been quoted lowest 400 bucks trying to save a bit of coin that's all

That’s called loading the parts cannon. It’s an expensive way to sort the issue. The codes indicate that set parameters for those sensors have been exceeded. That doesn’t mean they are faulty or broken. There are lots of causes for this.

You can’t bypass the O2’s because they supply critical engine management data for the ECM.

One of the easiest and mostly likely would be a huge vacuum leak/s. This is sorted with a smoke test. You can make something as I did, or drop some coin on a proper machine. Lots of YouTube vids that show how. You pump smoke into the intake. Where ever whisps of smoke appear, you’ll find the vacuum leak/s. A laser pointer is perfect for finding what our eye can’t see.

If you have unmetered air entering after the MAF and throttle body, the expected values by the the o2’s will not match and values will exceed set parameters.

There could be mechanical causes. It is unlikely every o2 is broken

You are on a budget, but to solve this will require highly specialised skills and equipment.

Cars are complex and expensive to fix. There is a lot of value in cars that had carbbies and vacuum lines.

Edit: not to take away from others, there are ways to delete o2’s but they would be highly specific and well guided circumstances with engine building applications. This is a road car and no major engine changes so that’s why I have said, don’t bypass o2’s. If you can’t afford $400, you can’t afford a new motor later if the underlying cause bricks the engine, and you can’t afford the tuner to delete them.

 

[Immortality]

Wasn't there recently a thread about a poor running engine that turned out to be rusted out exhaust/mufflers? Maybe the snap, crackle and pop tune has blown out the exhaust system?

 

[losh1971]

Wasn't there recently a thread about a poor running engine that turned out to be rusted out exhaust/mufflers? Maybe the snap, crackle and pop tune has blown out the exhaust system?

Well VE's do go spastic with cat problems.

 

[Skylarking]

As mentioned, modern cars are complex and require competent mechanics, specialist tools and thus lots of dollars to keep them in good shape and running well.

The best approach is to get the fault correctly diagnosed and the root cause identified. To do so you either need an honest mechanic that you trust or you need to have some skills and tools to do the work yourself.

A better approach would be for you to describe the problems you are experiencing and the general mechanical condition of the car along with the fault codes the car is presenting. Describe such within this thread and then forum members may be able to guide you through what needs to be done (by you or your mechanic) to get to the bottom of what is wrong.

But to say you just want to bypass a key component that is critical to the correct running of the engine with ensures low fuel consumption isn’t the correct approach. Doing such will make your car unroadworthy and void your insurance (I hope you do have at minimum a 3rd party property insurance which is above what NSW rego requires). Doing such bypass hacks is also complex and will likely cost much more than fixing the root cause (even if you can even find someone to make such illegal ecu programming hacks)…

The problem is that if you can’t afford to maintain you car, your costs will end up being higher as more things fail, fuel consumption goes up, and ultimately stuff fail catastrophically. You may also find yourself in deep trouble if you also use the same mindset with your steering, brakes and suspension and such neglect leads to a crash and someone’s death.

In any case, vehicle ownership is a privilege and not a right. If you can’t afford to keep a modern care roadworthy, consider an older simpler design, something pre cat converter with carbi as such cars are much easier and cheaper to keep maintained by the home mechanic using basic tools.

Doing things correctly doesn’t always mean $$$ as you can consider second hand parts from the wreckers to reduce repair costs… but this still required identifying the root cause…

PS: o2 sensor and/or cat problems can be caused by coolant leaks, wrong oil (too much zinc), wrong type of silicon gasket sealer used, etc… A well running engine will see cats and o2 sensors last the life of the vehicle (multiple decades)… o2 sensor issues can also be due to wiring, earthing of ecu faults… Simply chucking parts at the car can be a very very expensive way of finding what the root cause is…

 

[lmoengnr]

Wasn't there recently a thread about a poor running engine that turned out to be rusted out exhaust/mufflers? Maybe the snap, crackle and pop tune has blown out the exhaust system?

Or a leaking flange gasket.