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Questions tagged [cel]

An acronym for "Check Engine Light" warning light on a vehicle's dashboard.

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16 votes
2 answers
20k views

Why would a new gas cap cause the "check engine" light to shut off?

This happened to a friend of mine: The "check engine" light came on in his truck (Toyota). He replaced the gas cap and the light shut off. Then I also had a "check engine" light come on in my 1994 ...
No Clutch's user avatar
  • 263
2 votes
1 answer
32k views

Check Engine Light on '94 Jeep Grand Cherokee

How do I get Check Engine Light codes (OBD-I) from a '94 Jeep Grand Cherokee, and where can I look them up?
Iszi's user avatar
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22 votes
3 answers
1k views

What are good features to look for in an OBD-II reader

I recently took my car in for the engine light. It turned out to be a minor problem (crack in gas cap let water in). It would be nice to have a low-cost OBD-II reader to be able to find out for ...
Brian Carlton's user avatar
21 votes
2 answers
3k views

What possible causes for the "check engine" light can I check for myself?

The "Service Engine Soon" light came on yesterday and isn't going away on its own. The car drives fine, no weird noises, smells, or other symptoms. The manual is not very helpful, just directing me to ...
Robert's user avatar
  • 321
13 votes
3 answers
39k views

2005 Dodge Ram: Easy way to diagnose code P0420?

My truck is reporting a code P0420, which apparently is "Catalyst System Efficiency Below Threshold (Bank 1)" which can either be the catalytic converter or the rear O2 sensor. The code came on at ...
dave thieben's user avatar
12 votes
3 answers
110k views

Check Engine code P0420 Catalyst efficiency below threshold bank 1

After months of normal driving with no problems, my 2003 Honda Civic EX check engine light came on during a long trip. Got it scanned and it's P0420: Catalyst efficiency below threshold bank 1. They ...
endolith's user avatar
  • 1,351
3 votes
4 answers
55k views

How to fix P1167 in a 2001 Honda Accord, with a F23A4 engine

I used to have both P1166 and P1167 error codes on my 2001 Honda Accord (F23A4 engine). I fixed the P1166 by replacing the O2 sensor. For about a day, everything looked wonderful (i.e. no check ...
ususer's user avatar
  • 225
2 votes
4 answers
20k views

What does the Check Engine Light on 2000 Camry at 180,781 miles mean?

The check engine light just came on in my 2000 Camry. It has 180,781 miles, and the 180k mark is the recommended timing belt replacement mark. I've checked the tightness on the gas cap, and I'm ...
Nick DeVore's user avatar
8 votes
1 answer
15k views

How to Fix Check Engine Light (OBDII code: P0172)

I just saw the check engine light come on on my 2004 VW Passat B5.5 and did a bit of research. Some people said that it would be a faulty oxygen sensor. I was about to order one, but then I read this (...
Max Goodridge's user avatar
7 votes
3 answers
283k views

How serious is the Engine System Service Required message on a Volvo V50 2007?

I got a 2007 Volvo V50 last week and the "Engine System Service Required" message has appeared. how serious is that message and can only a Volvo garage do the diagnostics? It has done 41000 miles. I ...
dsample's user avatar
  • 173
6 votes
2 answers
525 views

What CAN'T the check engine light tell you?

Usually when something goes wrong with my vehicle the check engine light comes on. I had an issue recently where the check engine light did not turn on, but the vehicle ceased functioning. I read the ...
Josh's user avatar
  • 203
6 votes
4 answers
102k views

How do I resolve error code P1135 in my Toyota Camry?

I recently replaced the downstream O2 sensor in my Toyota Camry. Shortly thereafter, the check engine like came on again providing the following codes: P1135 which I understand to be the upstream ...
Tom's user avatar
  • 193
3 votes
2 answers
123k views

Does the checkengine light clear itself on it's own or require manual clearning?

I was discussing the behavior a car's check-engine light. When a check-engine light comes on, can the check-engine light turn off on it's own or does the check-engine light always require manually ...
syn1kk's user avatar
  • 416
2 votes
1 answer
81 views

Reset CEL after suspected repair or not?

Assume I get a CEL and I determine the code and perform the re[pair/replacement of what I suspect to be the most likely cause. At that time, is it better to reset the CEL [erase the code(s)] and wait ...
amphibient's user avatar
  • 6,653
2 votes
1 answer
2k views

2004 Buick LeSabre sputters in wet weather only when accelerating

My 2004 Buick LeSabre recently started behaving strangely. At first I thought I had filled up with some "bad gas." I used Heat to treat and after a week or so it seemingly started to work fine. Then ...
Jim's user avatar
  • 123
2 votes
2 answers
4k views

EVAP System or faulty CEL?

I drive a 4 cylinder 2001 Honda Accord LX and recently my check engine light turned on. The code was for the EVAP system, but I was wary of having it repaired immediately. I see 3 problems with a ...
lakechfoma's user avatar
2 votes
1 answer
4k views

P2646 after Head Gasket Replacement....WRONG or NO OIL?

I just had my head gasket replaced on my 05 civic... Driving city speeds felt fine, but I did notice a little bit of rattling, which I thought was just a new sound she would make due to the engine ...
Prodnegel's user avatar
  • 286
0 votes
1 answer
140 views

P0171 -- System Lean Bank 1

A few questions regarding P0171 -- System Lean Bank 1: If there is a problem with the fuel-air ratio, which this is basically about, why is it limited to only one of the two engine banks of a V6? ...
amphibient's user avatar
  • 6,653