Lexus Troubleshooting Questions? Ask a Lexus Expert
The automated chat service has forwarded your inquiry over to me. I'm a 35 year Toyota/Lexus expert. If you clear this code and drive the vehicle does the same exact code come back? How many miles are on the vehicle? Do you have the vehicle identification number available?
Upon further investigation into the vehicle identification number there are no outstanding customer support programs or technical service bulletins for this particular vehicle on this or pump issue. The code number that you're getting indicates that there is not enough air pressure in the system when the pump was commanded to activate to pump air into the exhaust for bank one which is the driver-side bank. Most of the time this ends up being a bad pump. The air pump is located under the intake manifold. That is a fairly large job to replace the air pump. You need to run diagnostic electrical tests on the pump and the driver to make sure that the pump functions. There's a driver module located on the left inner fender that has two large gauge wires if you apply power and ground to those two large gauge wires with the connector disconnected you should hear the pump run. If you do not there's a good chance of the pump has failed. In some cases it will damage the driver module itself. If you want to get into step-by-step electrical diagnostics and had a good voltmeter and reasonable knowledge of how to use it I could do that but the format here is a little difficult I could do a phone consultation if you would like. That comes at an additional cost I will submit that offer you can use that at any time. Click the attachment I've supplied it will show you an overview picture and the highlighted yellow pump the diverter valve are also known to Stick and fail. Please do not forget to rate the information that I provided you at three or higher and any bonus is greatly appreciated. If you need additional questions answered feel free to reply and I will get back to you.