My 2007 HHR is getting not good mileage and I've had the cat checked. No ck engine lights are on. What do I check next?

My 2007 HHR is getting not good mileage and I've had the cat checked. No ck engine lights are on. What do I check next? 3 Answers

no. 2 cyclinder on my chevy 2007 hhr is not firing what does that mean 3 Answers

put in new plugs and wires 3 weeks ago. the check engine light stays on and the cars idle is rough I was told the no. 2 cyclinder is not firing what does that mean and is that expensive

how do i find and repair the o2 sensors on my 2007 HHR 2 Answers

getting codes P0036, P0054, P0141, already checked the fuse and it's fine. I need to find out where exactly the o2 sensors are.

I replaced the ignition coil on my car because the no. 2 cyclinder was not firing. but the engine light is still on how do I reset it 2 Answers

my car engine light will not go off how do I reset it

2008 chevy HHR P0016 code what are my options to clear this code ? 3 Answers

2008 chevy hhr just recently bought the check engine like was not working and still doesn't. so when i bought it from the dealer i thought everything was ok well i took apart instrument cluster and fo...