RX450h F Sport misfiring then almost dying completely

[JBPRX400h]

On a short 1.5 mile journey home last Sunday my car (RX450h F Sport Gen 4) suddenly began misfiring very badly accompanied by a multitude of warning lights and dire warning messages (including “Stop as soon as possible within 0.3 miles) on the dashboard.

I pulled into a layby and turned the car off for a few minutes then started it up again. It started OK and the engine idled but the orange engine management light stayed on.

As I was only a few hundred yards from home I pulled away gently but the car very nearly ran out of power as I negotiated a roundabout so I pulled in to the side of the road and turned the engine off again. Tried starting it again and managed to limp home.

Rang Lexus Milton Keynes the next morning and they told me to contact the AA to bring the car in so they could look at it. Because I had to take my wife to hospital for an appointment at lunchtime I couldn't call the AA until mid afternoon. When the AA man arrived in his van he connected up an OBD scanner and it came up with a number of errors including

P0202 Injection valve cylinder 2 Component open

P0204 Injection valve cylinder 4 Component open

P0206 Injection valve cylinder 6 Component open

P1235 Fuel high pressure pump circuit defective

P3190 Engine Engine power too low

The AA man said he couldn't tow the car to the dealers and would have to arrange for a flat bed truck to do the job. He couldn't guarantee the truck would get to me in time to get to Lexus before they closed so it was arranged for the following morning.

Tuesday morning the truck arrived and the car and I were taken to Lexus MK where they have been trying to diagnose the problem since then but have not found the cause yet.

Has anyone had any similar problems and if so what was the solution? Any ideas or answers would be greatly appreciated as we would love to get our RX back soon.

Kind regards

JBP

PS The only up side is that I have been loaned a UX300e fully electric car in the interim which makes for an interesting comparison.

[rayaans]

43 minutes ago, JBPRX400h said:

On a short 1.5 mile journey home last Sunday my car (RX450h F Sport Gen 4) suddenly began misfiring very badly accompanied by a multitude of warning lights and dire warning messages (including “Stop as soon as possible within 0.3 miles) on the dashboard.

I pulled into a layby and turned the car off for a few minutes then started it up again. It started OK and the engine idled but the orange engine management light stayed on.

As I was only a few hundred yards from home I pulled away gently but the car very nearly ran out of power as I negotiated a roundabout so I pulled in to the side of the road and turned the engine off again. Tried starting it again and managed to limp home.

Rang Lexus Milton Keynes the next morning and they told me to contact the AA to bring the car in so they could look at it. Because I had to take my wife to hospital for an appointment at lunchtime I couldn't call the AA until mid afternoon. When the AA man arrived in his van he connected up an OBD scanner and it came up with a number of errors including

P0202 Injection valve cylinder 2 Component open

P0204 Injection valve cylinder 4 Component open

P0206 Injection valve cylinder 6 Component open

P1235 Fuel high pressure pump circuit defective

P3190 Engine Engine power too low

The AA man said he couldn't tow the car to the dealers and would have to arrange for a flat bed truck to do the job. He couldn't guarantee the truck would get to me in time to get to Lexus before they closed so it was arranged for the following morning.

Tuesday morning the truck arrived and the car and I were taken to Lexus MK where they have been trying to diagnose the problem since then but have not found the cause yet.

Has anyone had any similar problems and if so what was the solution? Any ideas or answers would be greatly appreciated as we would love to get our RX back soon.

Kind regards

JBP

PS The only up side is that I have been loaned a UX300e fully electric car in the interim which makes for an interesting comparison.

Itll be the injector or fuel pump.  Had the injector on mine but was sorted under warranty

[JBPRX400h]

I just found this on the US forum which sounds exactly like what happened to our car last week.

https://us.lexusownersclub.com/forums/topic/94700-my-fuel-pump-issue-~-rx-450h/

Have sent a copy to Lexus MK for their information.

JBP