pdxdrizzle Posted June 7, 2013 Share Posted June 7, 2013 Hi all, I need some help diagnosing check engine light. So a couple weeks ago the check engine light came on, and I took it to autozone and the pulled codes P1133, and P1135. P1135 is for the A/F sensor heater. P1133 is for the sensor itself and says it could be a Fuel Pump, injector, pressure regulator, a vac leak, or a fault sensor. From everything I've read, it doesn't really seem like the A/F sensor is bad. The car doesn't run poorly at all except for an occasional pulsating idol. It also does a weird thing (maybe unrelated?) but when I'm accelerating up a hill, there's a weird squeaky whining noise that hits about about 2500 RPM and drops off shortly after or as soon as you let off the throttle. My thinking is it's a vacuum leak, which is causing this weird noise. I've read a bit about how to check vac leaks, but I'm not sure where to look for the bank 1, sensor 1 A/F because it's tucked on the back of the engine. Thanks in advance for any help. I'm trying to avoid having to go in to a mechanic if I can, and I don't want to just throw money at the problem if I can go about it intelligently. A/F sensors are expensive. Thanks in advance for any help! Quote Link to comment Share on other sites More sharing options...
lenore Posted June 7, 2013 Share Posted June 7, 2013 first of all welcome aboard....Here is a thread that might help you...I stress buy original equipment air/fuel sensor only, many have had problems with aftermarket. Denso only..... http://www.clublexus.com/forums/rx-first-generation/340899-warning-lights.html Quote Link to comment Share on other sites More sharing options...
pdxdrizzle Posted June 7, 2013 Author Share Posted June 7, 2013 Lenore, Thanks for the reply! I have read a good dozen posts on how to replace the A/F sensor on these cars. But, what I am really curious about is ruling out a vacuum leak before I go buy a $200 sensor. Like I said above, there is a strange noise that I think could be a vacuum leak, during driving at certain speeds. My gas mileage hasn't changed, and the only other symptom is a very occasional rough idol. I looked around under the car near the A/F sensor, but was having a hard time finding the vac lines to trace and check. I just would like to know where the vacuum lines for this sensor are so I can see if a $10 hose will work before I buy a $200 sensor. Thanks! Quote Link to comment Share on other sites More sharing options...
lenore Posted June 8, 2013 Share Posted June 8, 2013 by the way the sensor can be had on Amazon for around $100..... Quote Link to comment Share on other sites More sharing options...
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