Check Engine: Code 25
03-05-07, 09:36 PM
#1
Driver
Thread Starter
Join Date: Oct 2005
Location: HI
Posts: 137
Likes: 0
Received 0 Likes
on
0 Posts
Check Engine: Code 25
1990-1994 Lexus LS400
code 25: Air–Fuel Ratio Lean Malfunction
anybody know what to troubleshoot?
mileage about 105k. everything clean..use all new parts.
im thinking its my engine ECU? clogged cats, y-pipe? <--anyway of testing?
cats heat up and start smelling and hear popcorn sounds.
have new ignition coils, spark plugs, spark plug wires, alternator, all 4 oxygen sensors (tested in spec. still) all new filters, fuel, air, oil, etc., getting fuel pressure and pump working. New MAF sensor, timing belt & water pump less than 20k ago.
runs rough cold..then check engine light pops up after 3 minutes.
Manual states that the main O2 sensors are being affected by the following:
1) open or short in main O2 sensor circuit.
2) Main O2 sensor
3) ignition system
4) engine coolant temp. sensor
5) blocked injector
6) volume air flow meter
7) loosr engine ground bolt
8) foreign object cought in valve
9) fuel line/injector leak or blocked
10) timing belt slipped
11) engine compression
12) ECM and or wire harness
any help is appreciated.
code 25: Air–Fuel Ratio Lean Malfunction
anybody know what to troubleshoot?
mileage about 105k. everything clean..use all new parts.
im thinking its my engine ECU? clogged cats, y-pipe? <--anyway of testing?
cats heat up and start smelling and hear popcorn sounds.
have new ignition coils, spark plugs, spark plug wires, alternator, all 4 oxygen sensors (tested in spec. still) all new filters, fuel, air, oil, etc., getting fuel pressure and pump working. New MAF sensor, timing belt & water pump less than 20k ago.
runs rough cold..then check engine light pops up after 3 minutes.
Manual states that the main O2 sensors are being affected by the following:
1) open or short in main O2 sensor circuit.
2) Main O2 sensor
3) ignition system
4) engine coolant temp. sensor
5) blocked injector
6) volume air flow meter
7) loosr engine ground bolt
8) foreign object cought in valve
9) fuel line/injector leak or blocked
10) timing belt slipped
11) engine compression
12) ECM and or wire harness
any help is appreciated.
03-07-07, 09:30 PM
#3
Lexus Test Driver
Join Date: Jul 2005
Location: il
Posts: 1,015
Likes: 0
Received 0 Likes
on
0 Posts
1990-1994 Lexus LS400
code 25: Air–Fuel Ratio Lean Malfunction
anybody know what to troubleshoot?
mileage about 105k. everything clean..use all new parts.
im thinking its my engine ECU? clogged cats, y-pipe? <--anyway of testing?
cats heat up and start smelling and hear popcorn sounds.
have new ignition coils, spark plugs, spark plug wires, alternator, all 4 oxygen sensors (tested in spec. still) all new filters, fuel, air, oil, etc., getting fuel pressure and pump working. New MAF sensor, timing belt & water pump less than 20k ago.
runs rough cold..then check engine light pops up after 3 minutes.
Manual states that the main O2 sensors are being affected by the following:
1) open or short in main O2 sensor circuit.
2) Main O2 sensor
3) ignition system
4) engine coolant temp. sensor
5) blocked injector
6) volume air flow meter
7) loosr engine ground bolt
8) foreign object cought in valve
9) fuel line/injector leak or blocked
10) timing belt slipped
11) engine compression
12) ECM and or wire harness
any help is appreciated.
code 25: Air–Fuel Ratio Lean Malfunction
anybody know what to troubleshoot?
mileage about 105k. everything clean..use all new parts.
im thinking its my engine ECU? clogged cats, y-pipe? <--anyway of testing?
cats heat up and start smelling and hear popcorn sounds.
have new ignition coils, spark plugs, spark plug wires, alternator, all 4 oxygen sensors (tested in spec. still) all new filters, fuel, air, oil, etc., getting fuel pressure and pump working. New MAF sensor, timing belt & water pump less than 20k ago.
runs rough cold..then check engine light pops up after 3 minutes.
Manual states that the main O2 sensors are being affected by the following:
1) open or short in main O2 sensor circuit.
2) Main O2 sensor
3) ignition system
4) engine coolant temp. sensor
5) blocked injector
6) volume air flow meter
7) loosr engine ground bolt
8) foreign object cought in valve
9) fuel line/injector leak or blocked
10) timing belt slipped
11) engine compression
12) ECM and or wire harness
any help is appreciated.
in the lexus manual...i belive(with it not beeing in front of me) is a code for 1 of the o2's...i think it would be the first o2 left side...u need to read the fine print...i think its 1 of the 02s
03-10-07, 11:10 AM
#5
This guy is having the same problem and his Cats ar turning red. Maybe you should read a bit in this thread.
https://www.clublexus.com/forums/sho...d.php?t=269784
https://www.clublexus.com/forums/sho...d.php?t=269784
Thread
Thread Starter
Forum
Replies
Last Post
