Last post on Oct 22, 2013 at 2:53 PM
You are in the Maintenance & Repair
What is this discussion about?
Fuel System, Electrical, Engine
#1651 of 1702 Re: Check engine light [slogan5]
Oct 01, 2009 (2:57 pm)
They need to read, and then clear, the error codes. They may not have fixed the original problem, but did a couple obvious first steps to see if they could have an impact.
If the error doesn't clear, it can stop you from passing inspection if that is one of your state requirements.
Take it back now. If you wait much longer they will treat it as a 'new' problem, and charge you for diagnosis time.
#1652 of 1702 1998 civic "Check Engine"
Nov 07, 2009 (8:58 am)
O2 sensor replaced by Honda dealer. "CE" came bak on. Independent mechanic replaced bosch plugs with NGK. I checked. They are correct type. "CE" came back on. Engine misses at idle. The code indicated catalytic converter. Still a third mechanic replaced the plug wires which made it run like new except for the stumbling idle and now "CE" back on (probably for the cat converter again).
Will get code checked soon. Have you seen this before? Thank you.
#1653 of 1702 Re: 1998 civic "Check Engine" [rcross]
by MrShift@Edmunds HOST
Nov 07, 2009 (9:02 am)
I've certainly seen hundreds of 02 sensors replaced needlessly because the "mechanic" doesn't test the old one for the voltage value range.
#1654 of 1702 Re: 1998 civic "Check Engine" [rcross]
Nov 09, 2009 (10:13 am)
I'm betting the code was something to do with catalytic converter efficiency? If so, that's sort of an indirect measure of the cat in that the algorithm compares the outputs of the front O2 sensor(s), which are in front of the cat, to the output of the rear O2 sensor, behind the cat. So, the problem could be with the other O2 sensor, the one that maybe wasn't replaced.
Though, misses at idle may mean the engine is dumping unburnt fuel into the exhaust, and hence into the cat. I think that can kill a cat pretty quickly.
Nov 10, 2009 (3:47 pm)
the CEL goes off and on while at highway speeds. It is a '94 Town Car, 145000 miles and runs great otherwise. What could be causing this?
#1656 of 1702 Re: Infrequently [euphonium]
Nov 10, 2009 (6:37 pm)
Take it to someone to check. Impossible to remotely diagnose that problem over the internet with that listed as the only symptom.
#1657 of 1702 P174 Code 99 Lincoln Town Car
Dec 22, 2009 (4:21 pm)
I have worked 2 weekends on my fathers TC. It would throttle back the engine after getting above 35 mph. We tried everything, fuel pump, O2 sensors, MAF sensor, etc. I was considering changing the computer. Then on a test drive I realized, the traction assist light was on when the car acted up. I pulled the fuse for the ABS and the car ran fine. I cleared the error and got another, U1036, "Undefined wheel size", my father had recently changed just the front tires. I found out that to save money, he changed the wheels from 16 to 15 inch. The ABS was detecting this difference and interpreting it as wheel slippage and trying to help. If you have the P174 or the U1036, beware, the tires or wheels might be the wrong size.
#1658 of 1702 Re: P174 Code 99 Lincoln Town Car [industmech]
Dec 23, 2009 (8:12 am)
What year is the TC and is it equipped with "Handling Package"?
#1659 of 1702 Re: P174 Code 99 Lincoln Town Car [euphonium]
Dec 24, 2009 (10:57 am)
99, sig series. I'm not susre about the "handling package" It has most of the butons.
#1660 of 1702 Check Engine Light Ford Tuarus 2001
Feb 28, 2011 (5:47 am)
2001 Ford Taurus check eng light on with a DTC P0402.This happens about every 2.5 years and I replace the Backpressure sensor and that will take care of it. Is this normal on this year? We brought it new and now has 58,000 + miles (wife car) I have had 2 other Taurus a 1996 with over 200,000 miles and a 2003 with 170,000 miles and have never replace that part. Purchase the part at Advance Auto Parts should I get Ford parts?