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So... John (Scorcher) told me this was an O2 sensor failure. The first bank sensor.
Dumb question - which one is that? ![Big Grin Big Grin](//www.focuscanada.net/forum/images/smilies/biggrin.gif) Please tell me whether it's the "top" or "bottom" O2 sensor for the Zetec as I have a header but still recall which sensor is which. IIRC they're still oriented in the same positions with the bottom one a little lower than the top one.
Second question - part number? Cost? Ken? Paging Ken!
I reset the DTC with my XCal2 and am carrying on for now. It doesn't seem to be hitting my fuel economy much... yet. Yes, I'm running the "helper" harness on the bottom O2 sensor, which is where I was told to run it quite some time ago. Point of interest - is that correct?
Daily driver 1: 2007 Jeep Wrangler Unlimited Sport "S"
33" BFG Mud-Terrain KM2s, lots of Rough Country gear - bumper, 2.5" lift, swaybar disconnects, Superwinch 10,000lb winch, Detroit Locker in rear D44 axle, custom exhaust, K+N filtercharger, Superchips-tuned.
Daily driver 2: 2006 Subaru Legacy GT
COBB Stage 1+ package - AccessPort tuner, COBB intake and airbox. Stage 2 coming shortly - COBB 3" AT stainless DP and race cat, custom 3" Magnaflow-based exhaust and Stage 2 COBB tune.
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first bank sensor is primary o2 sensor which is the first sensor downstream from the cynlinder head. second bank sensor is after the catalyic, and you should almost never get a code for that even if there is a failure on it due to the cheater harness you have.
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yep looking at primary sensor, heater circuit failure. car will idle weird until it warms up is all. just warms o2 sensor until car heats up enough to read correct
2007 ZX4 2.0l unaturally aspirated
FSwerks stage 2 Turbo kit, Cosworth Intake Manifold, 3" custom HKS turbo back
regular stage 2 @10ps : 232whp/219wtq
stage 2 plus @ 13psi: 278whp/229wtq
Stage 2 plus @15psi: 296whp/240wtq
2013 Focus ST Tuxedo Black - The daily
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08-09-2011, 03:22 AM
(This post was last modified: 08-09-2011, 03:23 AM by NOS2Go4Me.)
So... no need to replace? Yeah, it does idle a bit funky till it warms up.
And thanks Kev / Jamie for helping me cut my Zetec teeth.
Daily driver 1: 2007 Jeep Wrangler Unlimited Sport "S"
33" BFG Mud-Terrain KM2s, lots of Rough Country gear - bumper, 2.5" lift, swaybar disconnects, Superwinch 10,000lb winch, Detroit Locker in rear D44 axle, custom exhaust, K+N filtercharger, Superchips-tuned.
Daily driver 2: 2006 Subaru Legacy GT
COBB Stage 1+ package - AccessPort tuner, COBB intake and airbox. Stage 2 coming shortly - COBB 3" AT stainless DP and race cat, custom 3" Magnaflow-based exhaust and Stage 2 COBB tune.
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My wife's minivan had the same problem. Replaced sensor and it lasted about a couple of weeks. Bought a different type and it didn't have problem.
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Sensor arrives tomorrow. Then, I'll install it once the exhaust cools off and see what's what.
Daily driver 1: 2007 Jeep Wrangler Unlimited Sport "S"
33" BFG Mud-Terrain KM2s, lots of Rough Country gear - bumper, 2.5" lift, swaybar disconnects, Superwinch 10,000lb winch, Detroit Locker in rear D44 axle, custom exhaust, K+N filtercharger, Superchips-tuned.
Daily driver 2: 2006 Subaru Legacy GT
COBB Stage 1+ package - AccessPort tuner, COBB intake and airbox. Stage 2 coming shortly - COBB 3" AT stainless DP and race cat, custom 3" Magnaflow-based exhaust and Stage 2 COBB tune.
Posts: 9,588
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Joined: Mar 2004
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CEL went away. Idle smoothed out. Screw it, buying the new sensor anyway.
Daily driver 1: 2007 Jeep Wrangler Unlimited Sport "S"
33" BFG Mud-Terrain KM2s, lots of Rough Country gear - bumper, 2.5" lift, swaybar disconnects, Superwinch 10,000lb winch, Detroit Locker in rear D44 axle, custom exhaust, K+N filtercharger, Superchips-tuned.
Daily driver 2: 2006 Subaru Legacy GT
COBB Stage 1+ package - AccessPort tuner, COBB intake and airbox. Stage 2 coming shortly - COBB 3" AT stainless DP and race cat, custom 3" Magnaflow-based exhaust and Stage 2 COBB tune.
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