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Hiace 2.7 petrol P0138

DanBromley
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DanBromley Member

DanBromley

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Hi everyone, I’ve got a 2005 Hiace 2.7 petrol. It’s coming up with the P0138 fault code (O2 sensor bank 1 sensor 2 high voltage). I have changed the post-cat O2 sensor but it hasn’t made any difference and the fault code comes back after less than 50km. Occasionally it comes up with the P0136 code. The van is also using a lot of fuel.

After asking around and doing some of my own research I have been told it could be a vacuum leak, I’ve changed the intake manifold gasket as I’m aware these can fail sometimes but this also didn’t make any difference. I’ve also gone over the fuel system and changed spark plugs, cleaned/tested the fuel injectors, ran a can of upper engine cleaner through it. I’ve also replaced the vacuum solenoid valve (new genuine part) because one of the plastic barbs snapped off inside the hose, and I’ve also changed all of the vacuum hoses as they were rock solid.

I was wondering if anyone else has had a similar issue and what you did to fix it? If anyone can suggest anything else to try that I’ve missed that would be much appreciated.


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