Question about 2008 Chevrolet HHR 2.2
Replaced flex pipe with NAPA part and got check engine light. Code P0420. When I replaced the OEM pipe, I only saw one o2 sensor on the OEM flex pipe. Dealer says there should be two sensors. Where is the second sensor located. I purchased a new ECO-GM flex pipe from Eastern Catalytic #50459 which has two o2 ports on it, but I don't know where the second o2 sensor is located. Thanks...Victor B.
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Posted on Jan 02, 2017
you should have three oxygen sensors on your car, one for each bank of three cylinders; should be towards the Y pipe on each exhaust manifold. Additionally you should have one on the exhaust pipe before the cadilitic converter.
Posted on Nov 20, 2008
YEAH MAN I KNOW WHAT YOU ME, THOSE DARN COMPUTER ARE WAY TO SMART.. THERES NOTHING WRONG, BUT YOU CAN TAKE THE TRUCK TO A GM DEALER AND THEY CAN FLASH THE COMPTUER, BUT THE ONLY DOWNFALL IS THAT THE CHECK ENGINE LIGHT WILL NEVER WORK AGAIN.. SO ITS YOUR CALL..GOOD LUCK KEITH..
Posted on Mar 12, 2009
have you switched or cleaned the EGR valve sounds like the advance in the EGR is not working also check the vacume line to it .
Posted on Aug 29, 2009
P0420 code is usually a sign of s weak fuel pump, and needs to be replaced. Also if you replace the pump and still get that code, check your fuel lines back by the tank and make sure that they are not pinched or smashed. this will also give the same code due to restricted fuel pressure, on the ruturn or supply line........ Good Luck
Posted on Oct 08, 2010
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