The "check engine" light on my 2001 Toyota Sienna (V6, 88,000 miles) recently flashed on, and, before I had a chance to intervene, my wife took it in for its annual safety inspection and emissions test -- which it of course failed. Checked the codes and got: P1130 - "A/F Sensor Circuit Range/Performance" and P1155 - "A/F Sensor Heater Circuit." Been poking around on the internet, and I've learned that the 1130 code might not necessarily indicate a bad sensor, and I also get the impression (though it's hard to decipher some of what I've found) that the 1155 code might be directly related to the 1130 code (that is, one may be causing the other -- or both by a third problem). Any insight into this issue would be greatly appreciated since I'm not too excited about spending $300 to $400 replacing these parts if the part is not the problem. Also, if replacing the part(s) is my only option, any advice on that process would also be appreciated: I read somewhere, for example, that on a Sienna with a V6, there's a 50-50 chance that the first referenced sensor will be seized in the exhaust manifold, thus requirng my replacing the manifold as well. Help!
have the same problem?
Wednesday, January 10th, 2007 AT 9:53 AM