Honda Car Forum

Hello everyone. I never noticed that there was this option on yahoo. Has this always been around? Well straight to the point. I have a 1999 Honda prelude base. Problem is that my primary o2 sensor has gone bad. I pulled code P0131. P0131 Primary Heated Oxygen Sensor (Primary HO2S) (Sensor 1) Circuit Low Voltage. So basically I need to replace my o2 sensor. I did some research and looks VERY easy. One problem though. Which o2 sensor do I buy? OEM (Original Equip Manufacturer) prices the primary o2 sensor at 275-300 dollars; while AEM (Aftermarket Equip Manufacturer) prices the primary o2 sensor at about 70-200 bucks. OEM sensors are way too expensive while AEM is much cheaper. I understand that if I buy an OEM sensor, I will just need a simple, “Out with the old, In with the New” sensor application. What about AEM brand sensors? Is there an AEM brand sensor where I will not need to splice the wires? Just a simple, “Out with the old, In with the New”. If so which brand? Boch? Denso?

answer is simple......your primary o2 sensor is on the front half of the motor, on the exhaust manifold or on the downpipe, real easy to get to and swap out. as for splicing wires, no need to, because no matter which one you buy they all plug in. you will need to use an open end wrench unless you have the special socket for the sensors, which i am guessing not. autozone or oreilly's sells them cheaper, usually round $50 each. as for buying an aftermarket one from aem, not really a point because they don't add any significant power or anything like that, not usually worth the money. have fun!! but wait until the motor is cooled off, because metal expands and contracts with heat, and it would hurt alot if it's hot.

The DENSO replacement oxygen sensor (#2344621) is less than $40 and to check how easy it will be to wire up, take a look at a photo of its electrical connector at: http://www.rockauto.com/ref/Denso/De...34-4621_bw.jpg

find the catalytic converter, upwards and downwards you'll see the sensors with wires attached, the one closest to the motor is the before, the other after.Bosch created the oxygen sensor. You can guy the honda one, it's going to be made by someone else anway, maybe bosch, desno, etc.. AEM is a good brand, it really doesn't make much of a difference, they all meet oem spec and they are all heated (thus 4 wires).since you have a honda, they will not be cheap period, although they should be.goto an autozone and buy a pair of Bosch ones. people will say they suck, blah blah blah, in reality, there's nothing wrong with them. I've used Bosch, Denso, Standard and NTM, no problems with any of them.

Hi guys. I am having the same problem on a 2000 prelude, h22 non SH.. I bought a decent scanner off a guy on craigslist due to a check engine light. Is there anything else I could do before buying and replacing the O2 sensors? Can they be cleaned or would and after market air intake have affected this in some way?
Would an aftermarket intake manifold cause other problems that I don't know about?

P0131 1 Primary HO2S Circuit Low Voltage (Sensor 1)
P0132 2 Primary HO2S Circuit Low Voltage (Sensor 2)

Marcus