when I brought my 2002 Lexus rx300 to read the P-codes at auto-zone due to vsc and check engine lights are on it was a P1155 code which says that the fuel ratio sensor heater circuit malfunction. Is this something I need to fix right away? Also,when I look on the hose that connects from the air filter to the engine just to the right of the air filter box it was loose where it connects to the engine. Was this suppose to be a tight connection? I just have an oil and filter change at a toyota dealer three days ago.
Country: United StatesMake: LexusModel: RX300Year: 2002Engine: v-6
I initially disconnect the negative terminal of the battery to reset the lights and when I reconnect it after 10 minutes the lights were initially off but it turns on again after a few seconds.
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The P1155 is a fairly straight forward code pointing to a fault with the internal heater for the A/F Sensor for Bank2 Sensor1. The on-board computer uses this internal heater to get the sensor to normal operating temps within a matter of seconds on cold starts. Although you may not be experiencing any performance or drivabiliy issues, the inputs from this sensor are used to calculate the correct fuel and air distribution to the engine, and you may notice a drop in fuel economy. So- it may not be something you need to fix "right away" but it may be something you want to have replaced in the very near future. This sensor sells for around $233 and only take about a half-hour to make the repair.
As for the connection from air filter box to engine- yes, this should be a tight seal. No air should be allowed to enter through any holes, cracks or loose connections here.
I am not sure what happen during my oil change at the toyota dealer. A friend of mine told me that probably the hose connection from the air filter to the engine if loose is the problem when the lights went on. when I look at the connection to the engine, the about 1 1/4 inch hose from the air filter box is inserted to about 1/2 inch rubber tubing, is this right?
If the loose connection were the cause of the light, you would have gotten the appropriate "p-code" associated with this. The P1155 is very straight forward, and Toyota A/F Sensors have very high fail rates. I do not belive the loose connection is the cause of the light, however, it still not supposed to be loose. From what you are describing, it does seem right, but make sure it is tight, and there is no air leaking in. As long as there is no air getting in, it should be fine.