Auris rough running

Hey, I'm having trouble with my 2018 Toyota Auris hybrid. It's got about 197191 km on the clock. Lately, the check engine light keeps popping on, and the engine runs really rough, especially when it's cold. Sometimes, it even stalls when I'm idling, which is super annoying at traffic lights. And to top it off, it feels like the car is jerking a bit when I try to accelerate smoothly. I plugged in an OBD2 scanner and it's throwing a code related to the fuel pressure sensor. I've checked the obvious stuff like the fuel cap and tried cleaning the MAF sensor, but no luck. Could a bad fuel pressure sensor cause all these problems? It feels like something's not delivering fuel properly, like a clogged fuel injector or a failing fuel pump maybe?

4 comment(s)

I own an Auris as well, though I cannot speak to the hybrid aspect specifically. I experienced similar symptoms several months ago, including the engine stalling and the check engine light illuminating. The issues you describe could indeed be related to the fuel pressure sensor. Before replacing the sensor itself, I would suggest inspecting the cable and plug connection leading to the sensor. A loose or corroded connection can often mimic the symptoms of a defective sensor, a bit like a loose wire on a lamp causing it to flicker.

Thanks for the tip! That's really helpful. Where exactly is the fuel pressure sensor located on the Auris? I'm not super familiar with engine layouts. And what should I be looking for when I inspect the cable and plug? Is it just obvious corrosion, or could there be something else going on?

The fuel pressure sensor is typically located on the fuel rail, which supplies fuel to the fuel injectors. It should be a small sensor with an electrical connector attached. When inspecting the cable and plug, look for any signs of physical damage to the wires themselves – cuts, abrasions, or melted insulation. Check the connector for corrosion. Also, ensure the connector is securely attached to the sensor. If the connection feels loose, it may be the source of your problem. However, given the complexity and potential dangers of working with the fuel system, if you are not confident in your abilities, I would strongly recommend having a qualified technician diagnose and repair the issue. For me it turned out to be a defective cable and I had it fixed in the workshop.

Thanks so much for the advice! I checked the cable and plug connection like you suggested, and everything looked okay, but I wasn't 100% sure. Took it to my local garage in the end, and you were spot on! They found a faulty connection to the fuel pressure sensor. They replaced the connector, and it cost me 95€. The check engine light is gone, the engine runs smoothly, and no more stalling or jerking! Really appreciate the help!

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